FprEN 50483-3:2025

SLOVENSKI STANDARD
oSIST prEN 50483-3:2024
01-december-2024
Zahteve za preskušanje pribora za nizkonapetostne izolirane nadzemne kable - 3.
del: Napenjalne in vzmetne objemke za sisteme z nosilnim nevtralnim vodnikom
Test requirements for low voltage aerial bundled cable accessories - Part 3: Tension and
suspension clamps for neutral messenger system
Prüfanforderungen für Bauteile für isolierte Niederspannungsfreileitungen - Teil 3:
Abspann- und Tragklemmen für Systeme mit Nullleiter-Tragseil
Prescriptions relatives aux essais des accessoires pour réseaux aériens basse tension
torsadés - Partie 3: Matériels d'ancrage et de suspension pour réseaux aériens en
conducteurs isolés torsadés avec neutre porteur
Ta slovenski standard je istoveten z: prEN 50483-3
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
oSIST prEN 50483-3:2024 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 50483-3:2024
oSIST prEN 50483-3:2024
EUROPEAN STANDARD DRAFT
prEN 50483-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2024
ICS 29.240.20 Will supersede EN 50483-3:2009
English Version
Test requirements for low voltage aerial bundled cable
accessories - Part 3: Tension and suspension clamps for neutral
messenger system
Prescriptions relatives aux essais des accessoires pour Prüfanforderungen für Bauteile für isolierte
réseaux aériens basse tension torsadés - Partie 3: Niederspannungsfreileitungen - Teil 3: Abspann- und
Matériels d'ancrage et de suspension pour réseaux aériens Tragklemmen für Systeme mit Nullleiter-Tragseil
en conducteurs isolés torsadés avec neutre porteur
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2025-01-03.

It has been drawn up by CLC/TC 20.

If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 79845 Ref. No. prEN 50483-3 E

oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
Contents Page
1 European foreword . 3
2 Introduction . 4
3 1 Scope . 5
4 2 Normative references . 5
5 3 Terms and definitions . 5
6 4 Symbols . 7
7 5 Characteristics . 7
8 6 Marking . 7
9 7 General test conditions . 7
10 7.1 Mechanical tests . 7
11 7.2 Temperature . 8
12 8 Type tests . 8
13 8.1 General . 8
14 8.2 Type tests for tension clamps . 8
15 8.3 Type tests for suspension clamps . 19
16 8.4 Type tests for brackets . 34
17 Bibliography . 35

oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
18 European foreword
19 This document [prEN 50483-3:2024] has been prepared by WG 11 of CLC/TC 20 “Electric cables”.
20 This document is currently submitted to the Enquiry.
21 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
22 This document will supersede EN 50483-3:2009 and all of its amendments and corrigenda (if any).
23 prEN 50483-3:2024 includes the following significant technical changes with respect to EN 50483-3:2009:
24 This is Part 3 of CENELEC standard EN 50483 “Test requirements for low voltage aerial bundled cable
25 accessories”, which has six parts:
26 — Part 1: Generalities;
27 — Part 2: Tension and suspension clamps, fittings and brackets for self supporting system;
28 — Part 3: Tension and suspension clamps for neutral messenger system;
29 — Part 4: Connectors;
30 — Part 5: Electrical ageing test;
31 — Part 6: Environmental testing.
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
32 Introduction
33 The objective of the EN 50483 series is to provide a method of testing the suitability of accessories when used
34 under normal operating conditions with low voltage aerial bundled cables (ABC) complying with HD 626.
35 This European Standard does not invalidate existing approvals of products achieved on the basis of national
36 standards and specifications and/or the demonstration of satisfactory service performance. However, products
37 approved according to such national standards or specifications cannot directly claim approval to this
38 European Standard. It may be possible, subject to agreement between the customer and the manufacturer
39 and/or the supplier, and/or the relevant conformity assessment body, to demonstrate that conformity to the
40 earlier standard can be used to claim conformity to this standard, provided an assessment is made of any
41 additional type testing that may need to be carried out. Any such additional testing that is part of a sequence
42 of testing cannot be done separately.
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
43 1 Scope
44 EN 50483 series applies to overhead line fittings for tensioning, supporting and connecting aerial bundled
45 cables (ABC) of rated voltage U /U (U ): 0,6/1 (1,2) kV.
0 m
46 This Part 3 applies to tensioning devices consisting of tension and suspension clamps, and tension and
47 suspension assemblies used for the installation of ABC with either insulated or bare neutral messenger.
48 The tension and suspension clamps are designed to be installed on neutral conductors of ABC defined in
49 HD 626.
50 Tests described in this document are type tests.
51 2 Normative references
52 The following documents are referred to in the text in such a way that some or all of their content constitutes
53 requirements of this document. For dated references, only the edition cited applies. For undated references,
54 the latest edition of the referenced document (including any amendments) applies.
55 prEN 50483-1:2024, Test requirements for low voltage aerial bundled cable accessories
56 prEN 50483-2:2024, Test requirements for low voltage aerial bundled cable accessories
57 prEN 50483-6:2024, Test requirements for low voltage aerial bundled cable accessories
58 HD 626 S1:1996, Overhead distribution cables of rated voltage Uo/U(Um): 0,6/1 (1,2) kV
59 IEC 60050-461, International Electrotechnical Vocabulary (IEV) – Part 461: Electric cables
60 3 Terms and definitions
61 For the purposes of this document, the terms and definitions given in IEC 60050-461 and the following apply.
62 3.1
63 aerial bundled cable (ABC)
64 aerial cable consisting of a group of insulated conductors which are twisted together including, or not, a non
65 insulated conductor
66 [SOURCE: IEV 461-08-02, modified]
67 Note 1 to entry: The terms bundled conductors, bundled cables, bundled cores, conductor bundles and bundle could be
68 used as equivalent to the term aerial bundled cable (ABC).
69 3.2
70 aerial insulated cable
71 insulated cable designed to be suspended overhead and outdoors
72 [SOURCE: IEV 461-08-01]
73 3.3
74 angle of deviation
75 complementary angle to the angle defined by the two parts of the cable on both sides of the suspension clamp
76 3.4
77 clamp bolt
78 bolt which tightens two parts of a clamp together
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
79 3.5
80 conductor insulation
81 insulation applied on a conductor
82 [SOURCE: IEV 461-02-02, modified]
83 3.6
84 conductor (of a cable)
85 part of a cable which has the specific function of carrying current
86 [SOURCE: IEV 461-01-01]
87 3.7
88 core
89 assembly comprising conductor and its own insulation
90 [SOURCE: IEV 461-04-04, modified]
91 3.8
92 bracket (or fitting)
93 device for attaching ABC tension or/and suspension clamps to a pole or to a wall
94 3.9
95 insulation (of a cable)
96 insulating materials incorporated in a cable with the specific function of withstanding voltage
97 [SOURCE: IEV 461-02-01]
98 3.10
99 messenger
100 wire or rope, the primary function of which is to support the cable in aerial installations, which may be separate
101 from or integral with the cable it supports
102 [SOURCE: IEV 461-08-03]
103 3.11
104 minimum breaking load (MBL)
105 minimum breaking load of the conductor given by HD 626 or the cable manufacturer if not defined in the
106 standard or minimum breaking load of the clamp given by the clamp manufacturer
107 3.12
108 mobile link
109 device linking the suspension clamp to the bracket
110 3.13
111 neutral messenger system
112 aerial insulated system where only the neutral messenger supports the ABC
113 3.14
114 sheath
115 uniform and continuous tubular covering of metallic or non metallic material, generally extruded
116 [SOURCE: IEV 461-05-03]
117 3.15
118 suspension clamp
119 device which attaches an aerial insulated cable to a bracket in order to carry its weight and any specified
120 loading
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
121 [SOURCE: IEV 461-18-02, modified]
122 3.16
123 suspension or tension assembly
124 clamp with mobile link, or not, and associated bracket
125 3.17
126 tension clamp
127 device which firmly attaches an aerial insulated cable to a bracket and is designed to transmit the specified
128 mechanical tension in the cable or messenger to the supporting structure
129 [SOURCE: IEV 461-18-01, modified]
130 3.18
131 type test
132 test required to be made before supplying a type of material covered by this standard on a general
133 commercial basis, in order to demonstrate satisfactory performance characteristics to meet the intended
134 application
135 Note 1 to entry: These tests are of such a nature that, after they have been made, they need not be repeated unless
136 changes are made to the accessory materials, design or type of manufacturing process which might change the
137 performance characteristics.
138 4 Symbols
g slippage after 2 cycles
g slippage after 15 cycles
g slippage after 250 cycles
g slippage after 500 cycles
d diameter of core
α maximum angle (°) of deviation of a suspension clamp as recommended by the manufacturer or
specified by the customer
139 5 Characteristics
140 These fittings shall be capable of supporting the tensile loads applied to the ABC for which they are designed,
141 referring to the neutral messenger specified MBL, in accordance with the following tests.
142 Tension and suspension equipment shall be designed to avoid any direct or accidental contact between any
143 phase conductor and metallic parts of the clamp.
144 6 Marking
145 See Clause 6 of prEN 50483-1:2024.
146 7 General test conditions
147 7.1 Mechanical tests
148 See Clause 9 of prEN 50483-1:2024.
149 Where an assembly is to be tested, each bracket should be secured in accordance with the manufacturer’s
150 installation instructions.
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prEN 50483-3:2024 (E)
151 7.2 Temperature
152 See Clause 9 of prEN 50483-1:2024.
153 8 Type tests
154 8.1 General
155 Each clamp shall be tested for the smallest and largest messenger size except for environmental tests where
156 only the largest size is used.
157 8.2 Type tests for tension clamps
158 8.2.1 General
159 The following type tests shall be carried out.
Test Applicability Subclause
Tensile test at ambient insulated and bare neutral 8.2.2
temperature messenger
Tensile test at high insulated neutral messenger 8.2.3
temperature only
Tensile test at low insulated neutral messenger 8.2.4
temperature only
Environmental tests insulated and bare neutral 8.2.5
messenger
Clamp bolt tightening test common for both 8.3.1
suspension and tension
clamps
160 If a cable breaks beyond any part of the tension clamp, the test result shall be declared void without
161 discrediting the tension clamp. Tests shall be repeated using a new tension clamp and a new cable.
162 In order to find the possible cause of the failure, the test shall be repeated with a reference tension clamp as
163 specified in HD 626 S1:1996, Part 2, 2.3.1.
164 When agreed between the manufacturer and the customer, the mechanical test loads may be defined by the
165 smallest cable for the clamp but in this case the clamp may only be considered to conform to this standard for
166 the smaller cable size.
167 8.2.2 Tensile test at ambient temperature (and breaking load test)
168 8.2.2.1 Principle
169 The tension clamps shall be subjected to high mechanical loads at ambient temperature in order to ensure
170 that they are capable of sustaining loads likely to be encountered in service without being damaged or
171 damaging the conductor.
172 The test shall be carried out for the maximum and minimum insulated neutral messenger cross-sections, for
173 which the clamp is designed.
174 8.2.2.2 Test arrangement
175 Figure 1 shows a typical test arrangement. The test configuration can differ from this arrangement as long as
176 it complies with the neutral messenger lengths.
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
177 Dimensions in metres
179 Key
1 neutral messenger tension clamp

2 mechanical load measurement device mechanical junction allowing rotation

3 tensioning device current source connection

4 minimum 1 m mechanical tension adjustment

180 Figure 1 — Test arrangement
181 8.2.2.3 Procedure
182 For the maximum and minimum neutral messenger cross-sections, for which the clamp is designed, a tension
183 clamp shall be installed at a minimum of 1 m from the end of the cable sample. The tension clamp shall be
184 secured to a device similar to the one used for its attachment to the support. At the other end, which is not
185 stripped for insulated messenger, an appropriate tension device shall be attached to the neutral messenger by
186 means of a tension clamp or other appropriate device.
187 A different distance between the clamps (from 2 m to 10 m), may be agreed between the manufacturer and
188 the customer.
189 A load shall be applied and increased until it reaches 80 % of MBL of the messenger. The load shall then be
190 reduced to 20 % of MBL of the messenger.
191 The neutral messenger shall then be marked where it leaves the clamp so that any slippage can be seen with
192 respect to the clamp.
193 The load shall then be increased to 90 % of MBL of the messenger for both insulated and bare neutral
194 messenger. This load shall be maintained for 60 s.
195 The speed of load application is defined in prEN 50483-1:2024, 9.1.5.
196 8.2.2.4 Requirements
197 The clamp shall not slip by more than 10 mm with respect to the mark on the neutral messenger.
198 No damage shall occur which could affect the correct function of the tension clamp.
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
199 When agreed between the customer and the manufacturer, an additional test may be carried out as follows.
200 The previous test arrangement should be used again with a new tension clamp and the messenger should be
201 replaced with a steel wire of cross section equivalent to the neutral messenger. The assembly should be
202 subjected to an increasing load until the clamp breaks or the load reaches 110 % of the MBL of the
203 messenger. When a breaking occurs, the load at which the breaking occurs should be recorded. For practical
204 reason, to avoid any slippage between steel wire and clamp, fixed stops may be used.
205 8.2.3 Tensile test at high temperature
206 8.2.3.1 Principle
207 The purpose of this test is to ensure that the tension clamp does not slip excessively on the insulated neutral
208 messenger during service and that any movement does not damage the insulation. It combines heat cycles
209 with mechanical load.
210 8.2.3.2 Test arrangement
211 Figure 1 shows a typical test arrangement. The test configuration may differ from this arrangement as long as
212 it complies with the neutral messenger lengths.
213 The test shall be carried out for the maximum and minimum insulated neutral messenger cross-sections, for
214 which the clamp is designed.
215 8.2.3.3 Procedure
216 Tension clamps and the neutral messenger shall be subjected to this test, which comprises of 500 cycles, of
217 90 min each in which a heat cycle is combined with mechanical loads.
218 A tension clamp shall be fitted at least 1 m from both ends of the section of neutral messenger. The distance
219 between the clamps shall be at least 2 m.
220 A different distance between the clamps (from 2 m to 10 m) may be agreed between the manufacturer and the
221 customer.
222 Before starting the first cycle the neutral messenger shall be subjected to 10 % of its MBL and the sheath shall
223 be marked so that any slippage can be measured with respect to the clamp.
224 An alternating current shall be passed through the neutral messenger until its temperature rises to (60 ± 3) °C.
225 The temperature rise shall be achieved within 15 min and then maintained at this temperature for the next
226 30 min or until the total time is 45 min if the temperature is achieved more quickly.
227 The temperature of the neutral messenger shall be measured underneath the insulation with a thermocouple.
228 NOTE For further information on thermocouple application, see EN 50483-5, 5.4.1.
229 The temperature can be measured at a position that is not under mechanical tension. The measuring position
230 shall be at least 1 m from the clamp and the end of the neutral messenger. It shall also be at the same
231 horizontal level as the clamp in order to avoid any difference in air temperature.
232 The neutral messenger shall be allowed to cool to (25 ± 3) °C during the next 30 min. This temperature shall
233 be maintained for the next 15 min until the end of the cycle.
234 A mechanical load of 25 % of the MBL of the neutral messenger shall be applied, and maintained, for the first
235 75 min of the cycle. During the last 15 min once the neutral messenger has cooled to 25 °C, the load shall be
236 increased to 45 % of the MBL of the neutral messenger. This increase in load shall be gradually applied in not
237 less than 5 s and not more than 60 s.
238 If accelerated cooling is used, it shall act on the whole of the loop, and use air within ambient temperature
239 limits.
240 The cycle and the theoretical temperature profile are shown diagrammatically in Figure 2.
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
242 Key
1 selected value of mechanical load X time in minutes
Y
2 selected value of temperature temperature in °C
Y
3 temperature profile mechanical load in % of MBL of the neutral
messenger
4 one cycle
243 Figure 2 — Cycle and temperature profile
244 8.2.3.4 Requirements
245 8.2.3.4.1 Slippage checking
246 The neutral messenger sheath slippage with regard to the clamp shall comply with the following conditions:
247 • slippage after 2 cycles: g ≤ 4 mm;
248 • slippage after 500 cycles: g ≤ 10 mm.
249 8.2.3.4.2 Dielectrical voltage test
250 The clamp and conductors shall meet the requirements of the dielectrical voltage test as detailed in 8.2.6.3.
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
251 8.2.4 Tensile test at low temperature
252 8.2.4.1 Principle
253 The purpose of this test is to ensure that the tension clamp is suitable for use at −10 °C.
254 NOTE See prEN 50483-1:2024, 9.1, for information on the use of a lower temperature.
255 8.2.4.2 Test arrangement
256 Figure 3 shows a typical test arrangement.
257 The test shall be carried out for the maximum and minimum insulated neutral messenger cross-sections, for
258 which the clamp is designed.
260 Key
1 neutral messenger tension clamp tested

2 cold enclosure mechanical junction allowing rotation

3 mechanical load measurement device mechanical tension adjustment

4 tensioning device
261 Figure 3 — Arrangement of the fitting for mechanical test at low temperature
262 8.2.4.3 Procedure
263 The tension clamp shall be installed at a distance of a minimum 1 m from the end of a minimum 4 m long
264 neutral messenger sample. The tension clamp shall be secured to a device similar to the one used for its
265 fixing on the support. At the other end, which is not stripped, an appropriate tensioning device shall be set up.
266 During the tensile test, the clamp shall be located in an enclosure with a temperature of (−10 ± 3) °C.
267 A time period of 12 h is suggested which will allow the clamp to cool to −10 °C. However if the temperature of
268 the clamp can be measured the time period can be less, but shall not be less than 2 h as long as the
269 temperature of the clamp reaches −10 °C.
270 Under these conditions the tension clamp shall be gradually subjected to 25 % of the MBL of the neutral
271 messenger, within ± 5 % of the applied load, which shall be maintained at this value for 60 s. The conductor
272 shall then be marked where it leaves the clamp, and the load released. A load of 45 % of the MBL of the
273 neutral messenger shall be applied. The rise of the load between 10 % and 45 % shall take less than 2s.
274 Once 45 % achieved, the load can be released.
275 NOTE See prEN 50483-1:2024, 9.1, for information on the use of a lower temperature.
oSIST prEN 50483-3:2024
prEN 50483-3:2024 (E)
276 8.2.4.4 Requirements
277 There shall be
278 – no damage that could affect the correct function of the tension clamp,
279 – no slippage by more than 10 mm with respect to the mark on the insulated neutral messenger.
280 The clamp and conductor shall meet the requirements of the dielectrical voltage test as detailed in 8.2.6.3.
281 8.2.5 Environmental tests
282 8.2.5.1 General
283 In order to meet the requirements of the type tests at least one of the three corrosion tests (detailed in 8.2.5.2)
284 and one of the two climatic test methods (detailed in 8.2.5.5) shall be carried out. When a clamp that consists
285 only of metallic parts is designed for use on a bare messenger then, there is no requirement to carry out the
286 climatic tests. The choice of the test shall be agreed between the manufacturer and the customer.
287 8.2.5.2 Corrosion ageing test
288 See prEN 50483-6:2024, 8.4, modified in accordance with 8.2.5.3 or 8.2.5.4 below.
289 8.2.5.3 Salt mist test
290 8.2.5.3.1 Test criteria
291 See prEN 50483-6:2024, 8.4.1.
292 The following criteria shall be used during this test:
293 — Number of tension clamps shall be 2.
294 — Number of cycles shall be 4 (4 weeks).
295 — The cross section of the neutral messenger shall be the largest for which the clamp is designed.
296 8.2.5.3.2 Procedure
297 A tension clamp shall be installed at both ends of a neutral messenger section. The free length between
298 tension clamps shall be not less than 0,5 m.
299 The tension clamp and its attached fittings may be tested together if requested by the customer.
300 A load of 25 % of the MBL of the neutral messenger shall be smoothly applied to the device and maintained
301 for 10 min.
302 The clamps shall be placed in a horizontal position in a corrosion chamber with the tension clamps
303 longitudinal opening turned towards the ground.
304 8.2.5.3.3 Requirements
305 Visual inspection shall be carried out and there shall be no significant trace of red rust.
306 NOTE Significant rusting would constitute more than 10 % of the exposed surface area of the metallic parts.
307 The clamp’s identification marking shall be legible when examined with normal or corrected vision, without
308 magnification.
309 No damage shall occur which could affect the correct function of the tension clamp.
310 For tension clamps for insulated messenger the requirements of 8.2.2 shall be met except that the length of
311 the neutral messenger can be reduced to approximately 0,5 m. After the corrosion test, test defined in 8.2.2 is
312 carried out using a reduced value of 75 % of the test loads.
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prEN 50483-3:2024 (E)
313 If necessary, for tension clamps for bare messenger, the clamps shall be removed from the bare messenger
314 and re-installed onto a new bare messenger in accordance with the test arrangement of 8.2.2.2. The clamps
315 shall meet the requirements of 8.2.2.4. The bare messenger that has been exposed to the corrosion test shall
316 be examined to ensure that the conductor has not deteriorated in the area where the clamp has been
317 installed.
318 8.2.5.4 Gas atmosphere test
319 8.2.5.4.1 Test criteria – Method 1 – Combined test
320 See prEN 50483-6:2024, 8.4.1 and prEN 50483-6:2024, 8.4.2.1.
321 The following criteria shall be used during this test:
322 — Number of tension clamps shall be 2.
323 — There shall be 4 cycles of 14 days. This 14-day cycle consists of 7 days of salt mist and 7 days in SO
324 atmosphere as defined in prEN 50483-6:2024, 8.4.1 and prEN 50483-6:2024, 8.4.2.1.
325 — The cross section of the neutral messenger shall be the largest for which the clamp is designed. A
326 tension clamp shall be installed at both ends of a neutral messenger section. The free length between
327 tension clamps shall be approximately 0,5 m. The tension clamp and its attached fittings may be tested
328 together if requested by the customer.
329 — A load of 25 % of the MBL of the neutral messenger shall be smoothly applied to the device and
330 maintained for 10 min.
331 — The clamps shall be placed in a horizontal position in a corrosion chamber with the tension clamps
332 longitudinal opening turned towards the ground.
333 8.2.5.4.2 Test criteria – Method 2
334 See prEN 50483-6:2024, 8.4.2.2.
335 The following criteria shall be used during this test:
336 — Number of tension clamps shall be 2.
337 — There shall be 500 cycles of 2 h (approximately 6 weeks).
338 — The cross section of the neutral messenger shall be the largest for which the clamp is designed. A
339 tension clamp shall be installed at both ends of a neutral messenger section. The free length between
340 tension clamps shall be approximately 0,5 m. The tension clamp and its attached fittings may be tested
341 together if requested by the customer.
342 — A load of 25 % of the MBL of the neutral messenger shall be smoothly applied to the device and
343 maintained for 10 min.
344 — The clamps shall be placed in a horizontal position in a corrosion chamber with the tension clamps
345 longitudinal opening turned towards the ground.
346 8.2.5.4.3 Requirements (Method 1 and Method 2)
347 Visual inspection shall be carried out and there shall be no significant trace of red rust.
348 NOTE Significant rusting would constitute more than 10 % of the exposed surface area of the metallic parts.
349 The clamp’s identification marking shall be legible when examined with normal or corrected vision, without
350 magnification.
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prEN 50483-3:2024 (E)
351 No damage shall occur which would affect the correct function of the tension clamp.
352 For tension clamps for insulated messenger the requirements of 8.2.2 shall be met except that the length of
353 the neutral messenger can be reduced to approximately 0,5 m. After the corrosion test, test defined in 8.2.2 is
354 carried out using a reduced value of 75 % of the test loads.
355 If necessary, for tension clamps for bare messenger, the clamps shall be removed from the bare messenger
356 and re-installed onto a new bare messenger in accordance with the test arrangement of 8.2.2.2. The clamps
357 shall meet the requirements of 8.2.2.4. The bare messenger that has been exposed to the corrosion test shall
358 be examined to ensure that the conductor has not deteriorated in the area where the clamp has been
359 installed.
360 8.2.5.5 Climatic ageing test
361 See prEN 50483-6:2024, 8.5.
362 NOTE The climatic test is not necessary on bare messenger when the clamp has only metallic parts.
363 8.2.5.5.1 Test criteria – Method 1
364 See prEN 50483-6:2024, 8.5.1.
365 The following criteria shall be used during this test:
366 — Number of tension clamps shall be 2.
367 — The free conductor length between tension clamps could be reduced but shall be not less than 0,5 m.
368 — There shall be 6 cycles of 1 week.
369 — The temperature during periods A and C shall be 70 °C. The temperature may be varied if agreed
370 between the customer and the manufacturer.
371 — A load of 25 % of the MBL of the neutral messenger shall be smoothly applied to the device and
372 maintained for 10 min.
373 — The tension clamps shall be installed on the largest cross section of neutral messenger, for which the
374 clamp is designed, i
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