SIST EN 62817:2015/oprA2:2026

SLOVENSKI STANDARD
01-januar-2026
Fotonapetostni sistemi - Osnova zasnove sledilnikov sonca - Dopolnilo A2
Amendment 2 - Photovoltaic systems - Design qualification of solar trackers
Sonnen-Nachführeinrichtungen für photovoltaische Systeme - Bauarteignung
Systèmes photovoltaïques - Qualification de conception des suiveurs solaires
Ta slovenski standard je istoveten z: EN 62817:2015/prA2:2025
ICS:
27.160 Sončna energija Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

82/2507/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62817/AMD2 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-11-14 2026-02-06
SUPERSEDES DOCUMENTS:
82/2420/CD, 82/2470A/CC
IEC TC 82 : SOLAR PHOTOVOLTAIC ENERGY SYSTEMS
SECRETARIAT: SECRETARY:
United States of America Mr George Kelly
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the
final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Amendment 2 - Photovoltaic systems - Design qualification of solar trackers

PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
This project was discussed and supported by WG9 during their meeting in 2025-05.

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IEC CDV 62817/AMD2 © IEC 2025
1 INTERNATIONAL ELECTROTECHNICAL COMMISSION
2 ____________
4 PHOTOVOLTAIC SYSTEMS –
6 Design qualification of Solar Trackers
8 AMENDMENT 2
10 FOREWORD
11 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
12 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
13 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
14 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
15 Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
16 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
17 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
18 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
19 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
20 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
21 consensus of opinion on the relevant subjects since each technical committee has representation from all
22 interested IEC National Committees.
23 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
24 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
25 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
26 misinterpretation by any end user.
27 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
28 transparently to the maximum extent possible in their national and regional publications. Any divergence between
29 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
30 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
31 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
32 services carried out by independent certification bodies.
33 6) All users should ensure that they have the latest edition of this publication.
34 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
35 members of its technical committees and IEC National Committees for any personal injury, property damage or
36 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
37 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
38 Publications.
39 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
40 indispensable for the correct application of this publication.
41 9) [IEC/IEC and ISO] [draws/draw] attention to the possibility that the implementation of this document may involve
42 the use of (a) patent(s). [IEC/IEC and ISO] [takes/take] no position concerning the evidence, validity or
43 applicability of any claimed patent rights in respect thereof. As of the date of publication of this document,
44 [IEC/IEC and ISO] [had/had not] received notice of (a) patent(s), which may be required to implement this
45 document. However, implementers are cautioned that this may not represent the latest information, which may
46 be obtained from the patent database available at https://patents.iec.ch [and/or] www.iso.org/patents. [IEC/IEC
47 and ISO] shall not be held responsible for identifying any or all such patent rights.
48 Amendment 2 to IEC 62817-1:2014 has been prepared by subcommittee TC 82: Solar
49 photovoltaic energy systems.
50 The text of this Amendment is based on the following documents:
Draft Report on voting
82/2420/CD 82/2470A/CC
52 Full information on the voting for its approval can be found in the report on voting indicated in
53 the above table.
IEC CDV 62817/AMD2 © IEC 2025
54 The language used for the development of this Amendment is English.
55 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
56 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,
57 available at www.iec.ch/members_experts/refdocs. The main document types developed by
58 IEC are described in greater detail at www.iec.ch/publications/.
59 The committee has decided that the contents of this document will remain unchanged until the
60 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
61 specific document. At this date, the document will be
62 – reconfirmed,
63 – withdrawn, or
64 – revised.
65 ___________
IEC CDV 62817/AMD2 © IEC 2025
66 PHOTOVOLTAIC SYSTEMS –
67 DESIGN QUALIFICATION OF SOLAR TRACKERS
68 2 Normative references
69 ADD:
70 IEC 61836:2016, Solar photovoltaic energy systems - Terms, definitions and symbols
71 IEC 61800 Series, Adjustable speed electric DC power drive systems
72 IEC TS 62738:2018, Ground-mounted power plants – Design guidelines and
73 recommendations
74 IEC 60034-1:3022, Rotating Electrical machines – Part 1: Rating and performance
75 IEC 60034-5:2020, Rotating electrical machines - Part 5: Degrees of protection provided by
76 the integral design of rotating electrical machines (IP code) - Classification
77 IEC TR 60890:2022, A method of temperature-rise verification of low-voltage switchgear and
78 control-gear assemblies by calculation
79 IEC 60216 Series, determining the thermal endurance properties of electrical insulating
80 materials and simple combinations
81 IEC 60085:2007, Electrical insulation - Thermal evaluation and designation
82 IEC 61000-6-1:2016, Electromagnetic compatibility (EMC) - Part 6-1: Generic standards -
83 Immunity standard for residential, commercial and light-industrial environments
84 IEC 61000-6-2:2016, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards -
85 Immunity standard for industrial environments
86 IEC 61000-6-3:2020, Electromagnetic compatibility (EMC) - Part 6-3: Generic standards -
87 Emission standard for equipment in residential environments
88 IEC 61000-6-4:2018, Electromagnetic compatibility (EMC) - Part 6-4: Generic standards -
89 Emission standard for industrial environments
90 REVISE DATED REFERENCES:
91 IEC 60904-3: 2019, Photovoltaic devices – Part 3: Measurement principles for terrestrial photovoltaic
92 (PV) solar devices with reference spectral irradiance data
93 IEC 61000-4-5: 2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
94 techniques – Surge immunity test
95 DELETE:
96 ISO/IEC 17025, General requirements for the competence of testing and calibration
97 laboratories
98 3 Terms and definitions
IEC CDV 62817/AMD2 © IEC 2025
99 Revise first sentence:
100 For the purposes of this document, the following terms and definitions in IEC TS 61836 and the
101 following apply. For additional tracker-specific terminology, see Clause 6.
102 4 Specifications for solar trackers for PV applications
103 ADD the following text after Table 1:
104 For an alternate template for the presentation of accuracy specifications, see Table 6 in
105 clause 8.4.
106 5 Report
107 DELETE the following text:
108 A certified report of the qualification tests, with measured performance characteristics and
109 details of any failures and re-tests, shall be prepared. by the test agency in accordance with
110 ISO/IEC 17025. The report shall contain the specification sheet per Table 1.
111 6.8.3 Payload
112 REVISE the following text:
113 Accuracy testing (detailed in 7.4.6 8.4) will be carried out with an installed payload, either an array
114 of actual modules or an array of weights that simulate the mass, mass distribution, and wind
115 resistance of these modules.
116 6.12 Environmental conditions
117 ADD:
119 Solar trackers must be suitable for a wide range of outdoor environmental and climatic conditions. While
120 it is impossible to identify all combinations of the physical environment and operating conditions that
121 may be encountered at solar tracker installations, a framework for the definition of global environmental
122 conditions is presented in the IEC 60721 series of standards.
123 Each of the subcomponents should be chosen to meet related requirements within their relevant
124 standards for below operating conditions.
125 At a minimum, solar trackers must be capable of operation and storage in climatic conditions classified
126 as 4K26, in accordance with IEC 60721-3-4. Specifications for solar trackers may exceed these
127 minimum requirements as appropriate or necessary for the installed location, in particular, for hot or cold
128 weather environments.
129 6.12.1 to 6.12.20 specify additional requirements or modifications to the 4K26 classification, if any,
130 related to individual environmental parameters.
131 Table 2 - Classifications of climatic conditions
Classification
Environmental parameter Unit Sheltered Open-air
4K23 4K24 4K25 4K26 4K27
Low air temperature °C −45 −50 +5 −20 -50
IEC CDV 62817/AMD2 © IEC 2025
Classification
Environmental parameter Unit Sheltered Open-air
4K23 4K24 4K25 4K26 4K27
i i i
°C +70 +70
High air temperature +45 +50 +45
a
% 4 4 30 4 10
Low relative humidity
a
% 100 100 100 100 100
High relative humidity
a 3
0,2 0,003 6 0,1 0,003
Low absolute humidity g/m
a 3
35 20 35 30 25
High absolute humidity g/m
b
°C/min 1,0 1,0 1,0 1,0 1,0
Rate of change of temperature
c
kPa 70 70 70 70 70
Low air pressure
c
kPa 106 106 106 106 106
High air pressure
l l l
h h
1 090 1 090 1 090
Solar radiation W/m
f f
Heat radiation Not specified No No No

d d, f d, f f f f
m/s
Movement of surrounding air 5,0 5,0 22 22 22
Condensation Not specified Yes Yes Yes Yes Yes
m g g
Not specified Yes Yes Yes
Precipitation (rain, snow, hail, etc.) Yes Yes
g g
mm/min 15 15 15
Rain intensity No No
Driving rain m/s No No 18 18 18
2 g g
No No No
Snow load kg/m
e g g
°C +5 +5 +5
Low rain temperature No No
j j j
Not specified Dripping Dripping
Water from sources other than rain
water water
k k k
Not specified Yes Yes
Formation of ice and frost
Yes Yes Yes
a
The low and high relative humidity levels are limited by the low and high absolute humidity.
b
Averaged over a period of 5 min.
c
The value of 70 kPa represents a limit for open-air conditions, normally at an altitude of 3 000 m. In some
geographical areas, open-air conditions may occur at higher altitudes. Conditions in mines are not considered.
If applicable, a special value may be selected from IEC 60721-3-4, Table 2.
d
A cooling system based on non-assisted convection may be disturbed by adverse movement of surrounding air.
e
This rain temperature should be considered together with high air temperature and solar radiation. The cooling
effect of the rain should be considered in connection with the surface temperature of the product.
f
If applicable, a special value may be selected from IEC 60721-3-4, Table 2.
g
Applies only to wind-driven precipitation at sheltered locations.
h
Thermal effect of solar radiation is included in the temperature.
i
Thermal effect of solar radiation is not included in the temperature.
j
Sources of water other than rain are encompassed in driving rain.
k
Formation of frost can occur due to heat radiation to a clear sky.
l
From sea level.
m
See IEC 60721-2-2 for additional information.

133 6.12.1 Operating temperature range
134 ADD:
IEC CDV 62817/AMD2 © IEC 2025
136 All solar tracker systems and components shall be designed for a temperature range of -20˚C to 50˚
137 C at minimum.
138 The upper-temperature limit may also be increased up to 65˚C for products to be deployed in Arid and
139 equatorial regions, and the low-temperature limit may be reduced up to -40˚C for colder sites. This
140 may be accomplished by means of design or by additional equipment (E.g., adding heater elements
141 to enhance battery performance, or replacing with alternate or redundant power sources such as AC
142 from inverter, grid, active cooling components etc.).
143 ADD:
145 6.12.3 Humidity
146 Absolute air humidity range, minimum: 0,1 to 30 g/m
147 Relative air humidity range, minimum: 4% to 100% considering the interdependence of air temperature
148 and absolute air humidity according the Climatogram below (Referenced from IEC 60721-3-4).
149 Figure 1: Climatogram showing interdependence of air temperature and absolute air humidity.
151 6.12.4 Rain
152 Rain intensity, minimum: 15 mm/h
153 Wind Borne Rain velocity, minimum: 18 m/s
154 6.12.5 Air pressure (altitude)
155 Air pressure range, minimum: 79,5 kPa to 106 kPa (2,000 m to -400 m)
IEC CDV 62817/AMD2 © IEC 2025
156 For solar tracker installations at altitudes higher than 2,000 m, it may be necessary to account for
157 reduced air density in the calculations of dielectric strength, cooling effect and switching capability of
158 devices.
159 6.12.6 Flooding
160 Requirements to accommodate flooding are highly localized and determined on a site-specific basis. At
161 a minimum, electrical components are to be mounted higher than the peak expected flood level.
162 Particular attention shall be given to site hydrology considerations such as drainage and grading while
163 planning the foundation design.
164 6.12.7 Seismic (earthquake)
165 The system shall be designed to tolerate seismic shocks. Seismic (earthquake) requirements are
166 defined by local codes. Seismic retainer fasteners should be used for impacted sites and component
167 designs.
168 6.12.8 Dust/sand
169 Performance of tracker controls and moving components can be affected by dust and sand. Section
170 9.5.2 (a) and section 10.2.4 identify test requirements that include dust exposure testing.
171 6.12.9 Corrosion
172 Tracker components can experience different corrosion environments depending on their location. Piles
173 and foundations that penetrate the ground are subject to below ground corrosion mechanisms and
174 components above the ground experiences above ground corrosion. Each of these are treated
175 separately:
176 6.12.9.1 Below Ground Corrosion:
177 Requirements for corrosion design of below ground foundations are not covered in this standard as the
178 corrosion design for below ground corrosion needs to be tailored for the local site-specific conditions
179 based on a detailed geotechnical analysis. However, the scope of geotechnical studies should include
180 the following at a minimum to gather a comprehensive dataset for proper corrosion design.
181 1. Soil resistivity, corrosivity, aeration
182 2. Redox potential
183 3. pH, Sulphates, Sulfides, Chlorides,
184 The design life of the power plants is typically in the range of 25 to 50 years and the engineer of record
185 design shall document the approved design life from the project developer. Appropriate design using
186 coatings, sacrificial steel or a combination of both is allowed. Bare steel (black steel) designs are not
187 excluded from consideration for corrosion engineers.
188 The findings of the corrosion analysis shall consider inputs from the geotechnical analysis, and the
189 corrosion design reviewed and certified by a licensed geotechnical engineer with corrosion experience.
190 Trackers foundations are custom designed for the local site corrosion environment. The site specific
191 below ground design environment (Ex C2) and service life shall be identified in the site-specific product
192 documentation.
193 6.12.9.2 Above Ground Corrosion:
194 There are multiple parameters that influence atmospheric corrosivity above ground, but the three most
195 important are as follows:
IEC CDV 62817/AMD2 © IEC 2025
196 ▪ Time of wetness.
197 ▪ Atmospheric chloride content (salinity).
198 ▪ Atmospheric sulfur dioxide content.
200 Iron and steel parts shall be protected against corrosion by enameling, galvanizing, plating, sacrificial
201 corrosion coatings, painting or other equivalent means. This applies to all framing, fasteners, springs
202 and other parts which are relied upon for the intended mechanical operation.
204 At a minimum, solar trackers and equipment shall be designed to resist atmospheric corrosion category,
205 C2 per ISO 9223 Corrosivity of atmospheres – classification, determination, and estimation for the
206 design life of the tracker. Specifications for solar trackers may exceed these minimum requirements as
207 appropriate or necessary for the installed location, particularly in high-corrosion environments.
208 The design life of the power plants is typically in the range of 25 to 50 years and the engineer of record
209 design shall document the approved design life from the project developer. The findings of the corrosion
210 analysis shall consider inputs from the site-specific atmospheric conditions, and the corrosion design
211 shall be certified by a licensed engineer with corrosion experience.
212 Note: Many sites in China and India require a minimum of low C3 while some sites in the Middle East
213 require a minimum of low C4.
214 The requirements regarding appropriate corrosion coatings, other specific requirements and relevant
215 testing requirements are covered in IEC 63513, the Tracker Safety Standard.
216 Trackers are custom designed for the local site corrosion environment. The above ground design
217 environment and service life shall be identified in the site-specific product documentation.
218 6.12.10 Electromagnetic compatibility (EMC)
219 At a minimum, all solar tracker components shall meet the EMC immunity and emissions requirements
220 for industrial environments in accordance with IEC 61000-6-1, 61000-6-2, 61000-6-3, and 61000-6-4.
221 Particular tests in accordance with 61000-6-2 and 61000-6-4 include:
222 • Conducted emission
223 • Radiated emission
224 • Electric discharge
225 • Immunity to radiated field
226 • Electric fast transient surge
227 • Conducted immunity
228 • Immunity to magnetic field
229 • Short interruptions
230 6.12.11 Shock and vibration
231 Undesirable effects of shock and vibration (including those generated by the motor and its associated
232 equipment and those created by the physical environment) shall be avoided by the selection of suitable
233 equipment and mounting.
234 6.12.12 Ingress
235 At a minimum, all enclosed solar tracker components (controllers, power supplies, actuators, gear units,
236 etc.) shall be rated IP 55 in accordance with IEC 60529.
IEC CDV 62817/AMD2 © IEC 2025
237 6.12.13 Electrical supply
238 All components of the solar tracker shall be designed to operate correctly with the conditions of the
239 electrical supply as specified in sections 4.3.1, 4.3.2, or 4.3.3, as appropriate.
240 6.12.14 AC supplies
241 Voltage: Steady state voltage: 0,9 to 1,1 of nominal voltage
242 Frequency: 0,99 to 1,01 of nominal frequency continuously; 0,98 to 1,02 for a short time
243 Harmonics: Harmonic distortion not exceeding 12 % of the total r.m.s. voltage between live
th
244 conductors for the sum of the 2nd through to the 30 harmonic.
245 Voltage unbalance: Neither the voltage of the negative sequence component nor the voltage of the
246 zero-sequence component in three-phase supplies exceeding 2 % of the
247 positive sequence component.
248 Voltage interruption: Supply interrupted or at zero voltage for not more than 3 ms at any random time
249 in the supply cycle with more than 1 s between successive interruptions.
250 Voltage dips: Voltage dips not exceeding 20 % of the rms voltage of the supply for more than
251 one cycle with more than 1 s between successive dips.
252 6.12.15 DC supplies
253 From batteries
254 Voltage: 0,85 to 1,15 of nominal voltage
255 Voltage interruption: Not exceeding 5 ms
256 From converting equipment
257 Voltage:  0,9 to 1,1 of nominal voltage
258 Voltage interruption: Not exceeding 20 ms with more than 1 s between successive interruptions.
259 NOTE This is a variation to IEC Guide 106 to ensure proper operation of electronic
260 equipment.
261 Ripple (peak-to-peak): Not exceeding 0,15 of nominal voltage
262 6.12.19 Snow load
263 ADD the following text at the end of the paragraph:
264 The tracker shall be rated for a maximum snow load in kg/m . This snow loading shall be in
265 addition to the maximum rated payload (see 6.8.3). This standard does not address the
266 combination of wind and snow loadings. Local codes guide combined loads.
268 ADD:
269 7 Tracker Construction Requirements
270 7.1 Cables, Conductors and Wiring requirements
IEC CDV 62817/AMD2 © IEC 2025
271 7.1.1 General requirements
272 Conductors and cables shall be selected to be suitable for the operating conditions (for example
273 voltage, current, protection against electric shock, grouping of cables) and external influences (for
274 example ambient temperature, presence of water or corrosive substances, mechanical stresses
275 (including stresses during installation), fire hazards) that can exist. The choice of cables has an
276 electrical safety impact in solar trackers.
278 These requirements do not apply to the integral wiring of assemblies, subassemblies, and devices that
279 are manufactured and tested in accordance with their relevant IEC standard (for example IEC 61800
280 series).
281 7.1.2 Conductors
282 Conductors should be of copper. Where aluminium conductors are used, the cross-sectional area shall
283 be at least 16 mm .
284 To ensure adequate mechanical strength, the cross-sectional area of conductors should not be less
285 than as shown in Table 7. However, conductors with smaller cross-sectional areas or other
286 constructions than shown in Table 7 may be used in equipment provided adequate mechanical
287 strength is achieved by other means and proper functioning is not impaired.
289 Table 3 - Minimum cross-sectional areas of copper conductors
292 Class 1 and class 2 conductors are primarily intended for use between rigid, non-moving parts where
293 vibration is not considered to be likely to cause damage.
294 All conductors that are subject to frequent movement (for example one movement per hour of tracker’s
295 operation) should have flexible stranding of class 5 or class 6.
296 7.1.3 Insulation
297 The insulation of conductors and cables can constitute hazards due, for example, to the propagation
298 of a fire or the emission of toxic or corrosive fumes. For PV trackers which are intended to be deployed
IEC CDV 62817/AMD2 © IEC 2025
299 in a free field restricted access utility scale application, IEC 62738 allows the use of halogenated
300 cables.
301 The insulation of cables and conductors used, shall be suitable for the following test voltage:
302 • Not less than 2 000 V AC for a duration of 5 min for operation at voltages higher than 50 V AC or
303 120 V DC, or
304 • Not less than 500 V AC for a duration of 5 min for PELV circuits (see IEC 60364-4-41, protective
305 class III equipment).
306 The mechanical strength and thickness of the insulation shall be such that the insulation cannot be
307 damaged in operation or during laying, especially for cables pulled into conduit.
308 7.1.4 Current-carrying capacity in normal service
309 The current-carrying capacity depends on several factors, for example insulation material, number of
310 conductors in a cable, design (sheath), methods of installation, grouping and ambient temperature.
311 Note 1: Detailed information and further guidance can be found in IEC 60364-5-52, in some national standards or
312 given by the manufacturer. One typical example of the current-carrying capacities for PVC insulated wiring
313 between enclosures and individual items of equipment under steady-state conditions is given in 3.
314 Note 2: For specific applications where the correct cable dimensioning can depend on the relationship between
315 the period of the duty cycle and the thermal time constant of the cable (for example starting against high-inertia
316 load, intermittent duty), the cable manufacturer can provide information.
IEC CDV 62817/AMD2 © IEC 2025
318 Table 4 - Examples of current-carrying capacity (Iz) of PVC insulated copper conductors or cables
319 under steady-state conditions in an ambient air chamber at +40C for different methods of installation
322 7.1.5 Conductor and cable voltage drop
323 The voltage drop from the point of supply to the load in any power circuit cable shall not exceed 5 %
324 of the nominal voltage under normal operating conditions. In order to conform to this requirement, it
325 can be necessary to use conductors having a larger cross-sectional area than that derived from Table
326 3 above.
327 In control circuits, the voltage drop shall not reduce the voltage at any device below the manufacturer’s
328 specification for that device, also accounting for inrush currents.
329 The voltage drop in components, for example overcurrent protective devices and switching devices,
330 should be considered in the product design.
IEC CDV 62817/AMD2 © IEC 2025
331 7.1.6 Flexible cables
332 7.1.6.1 General
333 Flexible cables shall have Class 5 or Class 6 conductors.
334 Note 1: Class 6 conductors have smaller diameter strands and are more flexible than Class 5 conductors.
335 Cables that are subjected to severe duties shall be of adequate construction to protect against:
336 • Abrasion due to mechanical handling and dragging across rough surfaces
337 • Kinking due to operation without guides
338 • Stress resulting from guide rollers and forced guiding, being wound and re-wound on cable drums
339 Note 2: The operational life of the cable will be reduced where unfavorable operating conditions such as high
340 tensile stress, small radii, bending into another plane and/or where frequent duty cycles coincide.
341 7.1.6.2 Mechanical rating
342 The cable handling system of the solar tracker shall be so designed to keep the tensile stress of the
343 conductors as low as is practicable during tracker’s operations. Where copper conductors are used,
344 the tensile stress applied to the conductors shall not exceed 15 N/mm of the copper cross-sectional
345 area. Where the demands of the application exceed the tensile stress limit of 15 N/mm , cables with
346 special construction features should be used and the allowed maximal tensile stress should be agreed
347 with the cable manufacturer.
348 The maximum stress applied to the conductors of flexible cables with material other than copper shall
349 be within the cable manufacturer’s specification.
350 Note the following conditions may affect the tensile stress on the conductors:
351 • Acceleration forces
352 • Speed of motion
353 • Dead (hanging) weight of the cables
354 • Method of guiding
355 7.2 Wiring practices
356 7.2.1 Connections and routing
357 These requirements apply to:
358 • Conductors between controllers
359 • Conductors between controller to motor
360 • Conductors between controller / weather station and sensors
361 • Conductors of power source circuits to controllers
362 All connections, especially those of the protective bonding circuit, shall be secured against accidental
363 loosening.
364 The means of connection shall be suitable for the cross-sectional areas and nature of the conductors
365 being terminated.
IEC CDV 62817/AMD2 © IEC 2025
366 The connection of two or more conductors to one terminal is permitted only in those cases where the
367 terminal is designed for that purpose. However, only one protective conductor shall be connected to
368 one terminal connecting point.
369 Soldered connections shall only be permitted where terminals are provided that are suitable for
370 soldering.
371 Terminals on terminal blocks shall be plainly marked or labelled to correspond with the identification
372 used in the diagrams.
373 Note: IEC 61666 provides rules that can be used for the designation of terminals within the electrical equipment.
374 Where an incorrect electrical connection (for example, arising from replacement of devices) is
375 identified as a source of risk that needs to be reduced and it is not practicable to reduce the possibility
376 of incorrect connection by design measures, the conductors and/or terminations shall be identified.
377 The installation of flexible conduits and cables shall be such that liquids shall drain away from the
378 fittings.
379 Means of retaining conductor strands shall be provided when terminating conductors at devices or
380 terminals that are not equipped with this facility. Solder shall not be used for that purpose.
381 Shielded conductors shall be so terminated as to prevent fraying of strands and to permit easy
382 disconnection.
383 Identification tags shall be legible, permanent, and appropriate for the physical environment. Terminal
384 blocks shall be mounted and wired so that the wiring does not cross over the terminals.
385 7.2.2 Conductor and cable runs
386 Conductors and cables shall be run from terminal to terminal without splices or joints.
387 Connections using plug/socket combinations with suitable protection against accidental disconnection
388 are not considered to be splices or joints.
389 Exception: Where it is impracticable to provide terminals in a junction box (for example on trackers
390 having long flexible cables; cable connections exceeding a length which is not practical to be supplied
391 by the cable manufacturer on one cable drum), splices or joints may be used.
392 Where it is necessary to connect and disconnect cables and cable assemblies, sufficient extra length
393 shall be provided for that purpose.
394 The terminations of cables shall be adequately supported to prevent mechanical stresses at the
395 terminations of the conductors.
396 Wherever practicable, the protective conductor shall be placed close to the associated live conductors
397 in order to decrease the impedance of the loop.
398 7.2.3 Conductors of different circuits
399 Conductors of different circuits may be laid side by side, may occupy the same duct (for example
400 conduit, cable trunk system), or may be in the same multiconductor cable or in the same plug/socket
401 combination provided that the arrangement does not impair the proper functioning of the respective
402 circuits and:
403 • Where those circuits operate at different voltages, the conductors are separated by suitable
404 barriers or,
IEC CDV 62817/AMD2 © IEC 2025
405 • The conductors are insulated for the highest voltage to which any of the conductors can be
406 subjected, for example line to line voltage for unearthed systems and phase to earth voltage for
407 earthed systems
408 7.2.4 AC circuits – Electromagnetic effects (prevention of eddy currents)
409 Conductors of AC circuits installed in ferromagnetic enclosures shall be arranged so that all conductors
410 of each circuit, including the protective conductor of each circuit, are contained in the same enclosure.
411 Where such conductors enter a ferrous enclosure, they shall be arranged such that the conductors are
412 not individually surrounded by ferromagnetic material.
413 Single-core cables armored with steel wire or steel tape should not be used for AC circuits.
414 Note 1: The steel wire or steel tape armor of a single-core cable is regarded as a ferromagnetic enclosure. For
415 single-core wire armored cables, the use of aluminum armor is recommended.
416 Note 2: This content is derived from IEC 60364-5-52.
417 7.2.5 Connection between pick-up and pick-up converter of an inductive power supply system
418 The cable between the pick-up and the pick-up converter shall be:
419 • As short as practicable
420 • Adequately protected against mechanical damage
421 Note: The output of the pick-up can be a current source, therefore damage to the cable can result in a high voltage
422 hazard.
423 7.2.6 Identification of conductors
424 7.2.6.1 General requirements
425 Each conductor shall be identifiable at each termination in accordance with the technical
426 documentation.
427 It is recommended (for example to facilitate maintenance) that conductors be identified by number,
428 alphanumeric, color (either solid or with one or more stripes), or a combination of color and numbers
429 or alphanumeric. When numbers are used, they shall be Arabic; letters shall be Roman (either upper
430 or lower case).
431 Note: IEC 62491 provides rules and guidelines for the labelling of cables and cores/conductors used in industrial
432 installations, equipment, and products.
433 7.2.6.2 Identification of the protective conductor / protective bonding conductor
434 The protective conductor / protective bonding conductor shall be readily distinguishable from other
435 conductors by shape, location, marking, or color. When identification is by color alone, the bicolor
436 combination GREEN-AND-YELLOW shall be used throughout the length of the conductor. This color
437 identification is strictly reserved for protective conductors/protective bonding conductors.
438 For insulated conductors, the bicolor combination GREEN-AND-YELLOW shall be such that on any
439 15 mm length, one of the colors covers at least 30 % and not more than 70 % of the surface of the
440 conductor, the other color covering the remainder of the surface.
441 Where the protective conductor(s) can be easily identified by its shape, position, or construction (for
442 example a braided conductor, uninsulated stranded conductor), or where the insulated conductor is
443 not readily accessible or is part of a multicore cable, color coding throughout its length is not necessary.
IEC CDV 62817/AMD2 © IEC 2025
444 However, where the conductor is not clearly visible throughout its length, the ends or accessible
445 locations shall be clearly identified by the graphical symbol IEC 60417-5019:2006-08 (see Figure 7)
446 or with the letters PE or by the bicolor combination GREEN-AND-YELLOW.
447 7.2.6.3 Identification of the neutral conductor
448 Where a circuit includes a neutral conductor that is identified by color alone, the color used for this
449 conductor shall be LIGHT BLUE. To avoid confusion with other colors, it is recommended that an
450 unsaturated blue be used, called here “light blue” (see 6.2.2 of IEC 60445:2010). Where the selected
451 color is the sole identification of the neutral conductor, that color shall not be used for identifying any
452 other conductor where confusion is possible.
453 Where identification by color is used, bare conductors used as neutral conductors shall be either
454 colored by a stripe, 15 mm to 100 mm wide in each compartment or unit and at each accessible
455 location or colored throughout their length.
456 7.2.6.4 Identification by color
457 Where color-coding is used for identification of conductors (other than the protective bonding
458 conductor (see 10.2.2) and the neutral conductor (see 10.2.3)), the following colors may be used:
459 BLACK, BROWN, RED, ORANGE, YELLOW, GREEN, BLUE (including LIGHT BLUE), VIOLET,
460 GREY, WHITE, PINK, TURQUOISE.
461 Note: This list of colors is derived from IEC 60757.
462 It is recommended that, where color is used for identification, the color be used throughout the length
463 of the conductor either by the color of the insulation or by color markers at regular intervals and at the
464 ends or accessible location.
465 For safety reasons, the color GREEN or the color YELLOW should not be used where there is a
466 possibility of confusion with the bicolor combination GREEN-AND-YELLOW (see 10.2.2).
467 Color identification using combinations of those colors listed above may be used provided there can
468 be no confusion and that GREEN or YELLOW is not used except in the bicolor combination GREEN-
469 AND-YELLOW.
470 Where color-coding is used for identification of conductors, it is recommended that they be color-coded
471 as follows:
472 • BLACK: AC and DC power circuits
473 • RED: AC control circuits
474 • BLUE: DC control circuits
475 Exceptions to the above are permitted where insulation is not available in the colors recommended
476 (for example in multiconductor cables) or when local codes offer specific requirements.
477 7.2.6.5 Wiring inside enclosures
478 Conductors inside enclosures shall be supported where necessary to keep them in place. Where non-
479 metallic conduit is used, they must be made from flame-retardant insulating material (see the IEC
480 60332 series).
481 Connections to devices mounted on doors or to other movable parts shall be made using flexible
482 conductors in accordance with 9.2 and 9.6 to allow for the frequent movement of the part. The
483 conductors shall be anchored to the fixed part and to the movable part independently of the electrical
484 connection (see also 7.2.3).
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485 Conductors and cables not in conduit shall be adequately supported. Terminal blocks or plug/socket
486 combinations shall be used for control wiring that extends beyond the enclosure.
487 Power cables and cables of measuring circuits may be directly connected to the terminals of the
488 devices for which the connections were intended.
489 7.2.7 Wiring outside enclosures
490 7.2.7.1 General requirements
491 The means of introduction of cables or conduit with their individual glands, bushings, etc., into an
492 enclosure shall ensure that the degree of protection of enclosure is not reduced.
493 Conductors of a circuit shall not be distributed over different multi-core cables, conduits, cable ducting
494 systems or cable trunk systems. This is not required where a number of multi-core cables, forming one
495 circuit, are installed in parallel. Where multi-core cables are installed in parallel, each cable shall
496 contain one conductor of each phase and the neutral if any.
497 7.2.7.2 External conduit
498 Conductors and their connections external to the electrical equipment enclosure(s) shall be enclosed
499 in suitable conduit (i.e., conduit or cable trunk systems) except for suitably protected cables that may
500 be installed without conduit and with or without the use of cable trays or cable support means. Where
501 devices such as position switches or proximity switches are supplied with a dedicated cable, their cable
502 need not be enclosed in a duct when the cable is suitable for the purpose, sufficiently short, and so
503 located or protected, that the risk of damage is minimized.
504 Fittings used with conduit or cables shall be suitable for the physical environment. Flexible conduit or
505 flexible multiconductor cable shall be used where it is necessary to employ flexible connections to
506 pendant push-button stations. The weight of the pendant stations shall be supported by means other
507 than the flexible conduit or the flexible multiconductor cable, except where the conduit or cable is
508 specifically designed for that purpose.
509 7.2.7.3 Connection to moving elements of the solar tracker
510 The design of connections to moving parts shall account for the foreseeable frequency of movement
511 and shall be made using conductors in accordance with 9.2 and 9.6. Flexible cable and flexible conduit
512 shall be so installed as to avoid excessive flexing and straining, particularly at the fittings.
513 Cables subject to movement shall be supported in such a way that there is no mechanical strain on
514 the connection points nor any sharp flexing. When this is achieved by the provision of a loop, it shall
515 have sufficient length to provide for a bending radius of the cable as specified by the cable
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