IEC 61800-5-1:2007

INTERNATIONAL IEC
STANDARD
CEI
61800-5-1
NORME
Second edition
INTERNATIONALE
Deuxième édition
2007-07
Adjustable speed electrical
power drive systems –
Part 5-1:
Safety requirements –
Electrical, thermal and energy

Entraînements électriques de
puissance à vitesse variable –
Partie 5-1:
Exigences de sécurité –
Electrique, thermique et énergétique
Reference number
Numéro de référence
IEC/CEI 61800-5-1:2007
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INTERNATIONAL IEC
STANDARD
CEI
61800-5-1
NORME
Second edition
INTERNATIONALE
Deuxième édition
2007-07
Adjustable speed electrical
power drive systems –
Part 5-1:
Safety requirements –
Electrical, thermal and energy

Entraînements électriques de
puissance à vitesse variable –
Partie 5-1:
Exigences de sécurité –
Electrique, thermique et énergétique
PRICE CODE
XE
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 61800-5-1 © IEC:2007
CONTENTS
FOREWORD.5

Scope.7
2 Normative references.7
3 Terms and definitions .10
4 Protection against electric shock, thermal, and energy hazards .16
4.1 General .16
4.2 Fault conditions .17
4.3 Protection against electric shock.18
4.4 Protection against thermal hazards .51
4.5 Protection against energy hazards .56
4.6 Protection against environmental stresses .57
5 Test requirements.57
5.1 General .57
5.2 Test specifications.60
6 Information and marking requirements .82
6.1 General .82
6.2 Information for selection .85
6.3 Information for installation and commissioning .85
6.4 Information for use .89
6.5 Information for maintenance .91

Annex A (informative) Examples of protection in case of direct contact .93
Annex B (informative) Examples of overvoltage category reduction.95
Annex C (normative) Measurement of clearance and creepage distances . 101
Annex D (informative) Altitude correction for clearances . 107
Annex E (informative) Clearance and creepage distance determination for frequencies
greater than 30 kHz. 109
Annex F (informative) Cross-sections of round conductors. 112
Annex G (informative) Guidelines for RCD compatibility. 113
Annex H (informative) Symbols referred to in this part of IEC 61800 . 116

Bibliography . 117

Figure 1 – PDS hardware configuration within an installation.16
Figure 2 – Typical waveform for a.c. working voltage .19
Figure 3 – Typical waveform for d.c. working voltage .20
Figure 4 – Typical waveform for pulsating working voltage.20
Figure 5 – Examples for protection against direct contact .22
Figure 6 – Example of protective bonding .26
Figure 7 – Voltage limits under fault conditions.28
Figure 8 – Voltage test procedures .68
Figure 9 – Circuit for high-current arcing test.77

61800-5-1 © IEC:2007 – 3 –
Figure 10 – Test fixture for hot-wire ignition test .78
Figure A.1 – Protection by DVC A, with protective separation.93
Figure A.2 – Protection by means of protective impedance .94
Figure A.3 – Protection by using limited voltages .94
Figure B.1 – Basic insulation evaluation for circuits connected directly to the origin of
the installation supply mains.95
Figure B.2 – Basic insulation evaluation for circuits connected directly to the supply
mains.96
Figure B.3 – Basic insulation evaluation for equipment not permanently connected to the
supply mains.96
Figure B.4 – Basic insulation evaluation for circuits connected directly to the origin of
the installation supply mains where internal SPDs are used .96
Figure B.5 - Basic insulation evaluation for circuits connected directly to the supply
mains where internal SPDs are used .97
Figure B.6 – Example of protective separation evaluation for circuits connected directly
to the supply mains where internal SPDs are used.97
Figure B.7 – Example of protective separation evaluation for circuits connected directly
to the supply mains where internal SPDs are used.97
Figure B.8 Example of protective separation evaluation for circuits connected directly to
the supply mains where internal SPDs are used.98
Figure B.9 – Basic insulation evaluation for circuits not connected directly to the supply
mains.98
Figure B.10 – Basic insulation evaluation for circuits not connected directly to the supply
mains.98
Figure B.11 – Functional insulation evaluation within circuits affected by external
transients.99
Figure B.12 – Basic insulation evaluation for circuits both connected and not connected
directly to the supply mains .99
Figure B.13 – Insulation evaluation for accessible circuit of DVC A . 100
Figure G.1 – Flow chart leading to selection of the RCD/RCM type upstream of a PDS . 113
Figure G.2 – Fault current waveforms in connections with semiconductor devices. 114

Table 1 – Alphabetical list of terms.10
Table 2 – Relevance of requirements to PDS/CDM/BDM.17
Table 3 – Summary of the limits of the decisive voltage classes.18
Table 4 – Protection requirements for considered circuit.19
Table 5 – Protective earthing conductor cross-section .28
Table 6 – Definitions of pollution degrees .31
Table 7 – Insulation voltage for low voltage circuits.33
Table 8 – Insulation voltage for high voltage circuits .33
Table 9 – Clearance distances .37
Table 10 – Creepage distances (mm) .39
Table 11 – Thickness of sheet metal for enclosures: carbon steel or stainless steel .45
Table 12 – Thickness of sheet metal for enclosures: aluminium, copper or brass .46
Table 13 – Wire bending space from terminals to enclosure .49
Table 14 – Generic materials for the direct support of uninsulated live parts .52
Table 15 – Maximum measured temperatures for internal materials and components.54

– 4 – 61800-5-1 © IEC:2007
Table 16 – Maximum measured temperatures for external parts of the CDM .55
Table 17 – Test overview .59
Table 18 – Impulse voltage test.63
Table 19 – Impulse test voltage for low-voltage PDS .64
Table 20 – Impulse test voltage for high-voltage PDS .64
Table 21 – A.C. or d.c. test voltage for circuits connected directly to low voltage mains.65
Table 22 – A.C. or d.c. test voltage for circuits connected directly to high voltage mains .66
Table 23 – A.C. or d.c. test voltage for circuits not connected directly to the mains .67
Table 24 – Partial discharge test .70
Table 25 – Dry heat test (steady state) .80
Table 26 – Damp heat test (steady state) .81
Table 27 – Vibration test .82
Table 28 – Information requirements .84
Table C.1 – Width of grooves by pollution degree . 101
Table D.1 – Correction factor for clearances at altitudes between 2 000 m and 20 000 m
(see 4.3.6.4.1) . 107
Table D.2 – Test voltages for verifying clearances at different altitudes. 107
Table E.1 – Minimum values of clearances in air at atmospheric pressure for
inhomogeneous field conditions (Table 1 of IEC 60664-4). 110
Table E.2 – Minimum values of creepage distances for different frequency ranges
(Table 2 of IEC 60664-4).111
Table F.1 – Standard cross-sections of round conductors . 112
Table H.1 – Symbols used.116

61800-5-1 © IEC:2007 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS –

Part 5-1: Safety requirements –
Electrical, thermal and energy

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61800-5-1 has been prepared by subcommittee 22G: Semi-
conductor power converters for adjustable speed electric drive systems, of IEC technical
committee 22: Power electronic systems and equipment.
This second edition cancels and replaces the first edition published in 2003. It constitutes a
technical revision.
The major areas of change in this edition are the following:
a) addition of alphabetical Table 1 in Clause 3;
b) addition of Table 2 in 4.1 for relevance to PDS/CDM/BDM;
c) addition of Table 4 summary of decisive voltage class requirements;
d) expansion of subclause on protective bonding (4.3.5.3);

– 6 – 61800-5-1 © IEC:2007
e) clarification of distinction between touch current and protective conductor current;
f) revision of section on insulation (now 4.3.6) to include solid insulation;
g) addition of overvoltage categoruies I and II to HV insulation voltage;
h) revision of section on Solid insulation (now 4.3.6.8)
i) addition of high-frequency insulation requirements (4.3.6.9, Annex E);
j) addition of requirements for liquid-cooled PDS (4.4.5);
k) addition of climatic and vibration tests (5.2.6);
l) clarification of voltage test procedure to avoid over-stress of basic insulation (5.2.3.2.3);
m) revision of short-circuit test requirement for large, high-voltage and one-off PDS (now
5.2.3.6);
n) addition of informative Annex B for overvoltage category reduction.
The text of this standard is based on the following documents:
FDIS Report on voting
22G/178/FDIS 22G/181/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61800 series, published under the general title Adjustable speed
electrical power drive systems, can be found on the IEC website.
Terms in italics in the text are defined in Clause 3.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61800-5-1 © IEC:2007 – 7 –
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS –

Part 5-1: Safety requirements –
Electrical, thermal and energy

1 Scope
This part of IEC 61800 specifies requirements for adjustable speed power drive systems, or
their elements, with respect to electrical, thermal and energy safety considerations. It does not
cover the driven equipment except for interface requirements. It applies to adjustable speed
electric drive systems which include the power conversion, drive control, and motor or motors.
Excluded are traction and electric vehicle drives. It applies to d.c. drive systems connected to
line voltages up to 1 kV a.c., 50 Hz or 60 Hz and a.c. drive systems with converter input
voltages up to 35 kV, 50 Hz or 60 Hz and output voltages up to 35 kV.
Other parts of IEC 61800 cover rating specifications, EMC, functional safety, etc.
The scope of this part of IEC 61800 does not include devices used as component parts of a
PDS if they comply with the safety requirements of a relevant product standard for the same
environment. For example, motors used in PDS shall comply with the relevant parts of
IEC 60034.
Unless specifically stated, the requirements of this International Standard apply to all parts of
the PDS, including the CDM/BDM (see Figure 1).
NOTE In some cases, safety requirements of the PDS (for example, protection against direct contact) can
necessitate the use of special components and/or additional measures.
2 Normative references
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
NOTE This does not mean that compliance is required with all clauses of the referenced documents, but rather
that this international standard makes a reference that cannot be understood in the absence of the referenced
document.
IEC 60034 (all parts), Rotating electrical machines
IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance
IEC 60034-5, Rotating electrical machines – Part 5: Degrees of protection provided by the
integral design of rotating electrical machines (IP code) - Classification
IEC 60050-111, International Electrotechnical Vocabulary (IEV) – Chapter 111: Physics and
chemistry
– 8 – 61800-5-1 © IEC:2007
IEC 60050-151, International Electrotechnical Vocabulary (IEV) – Part 151: Electrical and
magnetic devices
IEC 60050-161, International Electrotechnical Vocabulary (IEV) – Chapter 161:
Electromagnetic compatibility
IEC 60050-191, International Electrotechnical Vocabulary (IEV) – Chapter 191: Dependability
and quality of service
IEC 60050-441, International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear,
controlgear and fuses
IEC 60050-442, International Electrotechnical Vocabulary (IEV) – Part 442: Electrical
accessories
IEC 60050-551, International Electrotechnical Vocabulary (IEV) – Part 551: Power electronics
IEC 60050-601, International Electrotechnical Vocabulary (IEV) – Chapter 601: Generation,
transmission and distribution of electricity – General
IEC 60060-1:1989, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60068-2-2:1974, Environmental testing – Part 2: Tests. Tests B: Dry heat
IEC 60068-2-6, Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-78, Environmental testing – Part 78: Tests – Test Cab: Damp heat, steady state
IEC 60112:2003, Method for the determination of the proof and the comparative tracking
indices of solid insulating materials
IEC 60204-11, Safety of machinery – Electrical equipment of machines – Part 11:
Requirements for HV equipment for voltages above 1 000 V a.c. or 1 500 V d.c. and not
exceeding 36 kV
IEC 60309, Plugs, socket-outlets and couplers for industrial purposes
IEC 60364-1, Low-voltage electrical installations – Part 1: Fundamental principles, assessment
of general characteristics, definitions
IEC 60364-5-54:2002, Electrical installations of buildings – Part 5-54: Selection and erection of
electrical equipment – Earthing arrangements, protective conductors and protective bonding
conductors
IEC 60417, Graphical symbols for use on equipment
IEC 60529:1989, Degrees of protection provided by enclosures (IP code)
IEC 60617, Graphical symbols for diagrams

61800-5-1 © IEC:2007 – 9 –
IEC 60664-1:1992, Insulation coordination for equipment within low-voltage systems – Part 1:
1)
Principles, requirements and tests
Amendment 1 (2000)
Amendment 2 (2002)
IEC 60664-3:2003, Insulation coordination for equipment within low-voltage systems – Part 3:
Use of coating, potting or moulding for protection against pollution
IEC 60664-4:2005, Insulation coordination for equipment within low-voltage systems – Part 4:
Consideration of high-frequency voltage stress
IEC 60695-2-10, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods – Glow-
wire apparatus and common test procedure
IEC 60695-2-13, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods – Glow-
wire ignitability test method for materials
IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical
flame test methods
IEC 60695-11-20, Fire hazard testing – Part 11-20: Test flames – 500 W flame test methods
IEC 60755, General requirements for residual current operated protective devices
IEC 60947-7-1:2002, Low-voltage switchgear and control gear – Part 7-1: Ancillary equipment
–Terminal blocks for copper conductors
IEC 60947-7-2:2002, Low-voltage switchgear and controlgear – Part 7-2: Ancillary equipment –
Protective conductor terminal blocks for copper conductors
IEC 60990:1999, Methods of measurement of touch current and protective conductor current
IEC 61230, Live working – Portable equipment for earthing or earthing and short-circuiting
IEC 61800-1, Adjustable speed electrical power drive systems – Part 1: General requirements
– Rating specifications for low voltage adjustable speed d.c. power drive systems
IEC 61800-2, Adjustable speed electrical power drive systems – Part 2: General requirements
– Rating specifications for low voltage adjustable frequency a.c. power drive systems
IEC 61800-4, Adjustable speed electrical power drive systems – Part 4: General requirements
– Rating specifications for a.c. power drive systems above 1 000 V a.c. and not exceeding
35 kV
IEC 62020, Electrical accessories – Residual current monitors for household and similar uses
(RCMs)
___________
There exists a consolidated edition 1.2 (2002) including IEC 60664-1:1992 and its Amendments 1 and 2.

– 10 – 61800-5-1 © IEC:2007
IEC 62271-102, High-voltage switchgear and controlgear – Part 102: Alternating current
disconnectors and earthing switches
ISO 3864 (all parts), Graphical symbols – Safety colours and safety signs
ISO 7000:2004, Graphical symbols for use on equipment – Index and synopsis
3 Terms and definitions
For the purposes of this international standard, the terms and definitions given in
IEC 60050-111, IEC 60050-151, IEC 60050-161, IEC 60050-191, IEC 60050-441,
IEC 60050-442, IEC 60050-551, IEC 60050-601, IEC 60664-1, IEC 61800-1, IEC 61800-2,
IEC 61800-3 and IEC 61800-4 (some of which are repeated below for convenience), and the
following definitions apply.
Table 1 provides an alphabetical cross-reference listing of terms.
Table 1 – Alphabetical list of terms
Term Term Term Term Term Term
number number number
adjacent circuit 3.1 (earth) leakage current 3.16 protective screening 3.31
basic drive module 3.2 live part 3.17 protective separation 3.32
(BDM)
basic insulation 3.3 low-voltage PDS 3.18 reinforced insulation 3.33
CDM (complete drive 3.4 open-type (product) 3.19 routine test 3.34
module )
closed electrical 3.5 power drive system 3.20 safety ELV (SELV) 3.35
operating area (PDS) circuit
commissioning test 3.6 protective ELV (PELV) 3.21 sample test 3.36
circuit
decisive voltage class 3.7 prospective short-circuit 3.22 supplementary insulation 3.37
(DVC) current
double insulation 3.8 protective bonding 3.23 system voltage 3.38

extra low voltage (ELV) 3.9 protective class 0 3.24 temporary overvoltage 3.39
electrical breakdown 3.10 protective class I 3.25 touch current 3.40
expected lifetime 3.11 protective class II 3.26 type test 3.41
functional insulation 3.12 protective class III 3.27 user terminal 3.42
high-voltage PDS 3.13 protective earthing (PE) 3.28 working voltage 3.43
installation 3.14 protective earthing 3.29 zone of equipotential 3.44
conductor bonding
integrated PDS 3.15 protective impedance 3.30

3.1
adjacent circuit
circuit having no galvanic connection to the circuit under consideration
NOTE A protective impedance is not considered to be a galvanic connection.

61800-5-1 © IEC:2007 – 11 –
3.2
basic drive module (BDM)
drive module, consisting of a converter section and a control section for speed, torque, current
or voltage, etc. (see Figure 1)
3.3
basic insulation
insulation applied to live parts to provide basic protection against electrical shock
[IEV 826-12-14, modified]
3.4
complete drive module
CDM
drive system, without the motor and the sensors which are mechanically coupled to the motor
shaft, consisting of, but not limited to, the BDM, and extensions such as feeding section and
auxiliaries (see Figure 1)
3.5
closed electrical operating area
room or location for electrical equipment to which access is restricted to skilled or instructed
persons by the opening of a door or the removal of a barrier by the use of a key or tool and
which is clearly marked by appropriate warning signs
3.6
commissioning test
test on a device or equipment performed on site, to prove the correctness of installation and
operation
[IEV 151-16-24, modified]
3.7
decisive voltage class
DVC
classification of voltage range used to determine the protective measures against electric
shock
3.8
double insulation
insulation comprising both basic insulation and supplementary insulation
[IEV 826-12-16]
NOTE Basic and supplementary insulation are separate, each designed for basic protection against electric shock.
3.9
extra low voltage
ELV
any voltage not exceeding 50 V a.c. r.m.s. and 120 V d.c.
NOTE 1 R.M.S. ripple voltage of not more than 10 % of the d.c. component.
NOTE 2 In this international standard, protection against electric shock is dependent on the decisive voltage
classification. DVC A and B are contained in the voltage range of ELV.

– 12 – 61800-5-1 © IEC:2007
3.10
electrical breakdown
failure of insulation under electric stress when the discharge completely bridges the insulation,
thus reducing the voltage between the electrodes almost to zero
[IEC 60664-1:1992, definition 1.3.20]
3.11
expected lifetime
minimum duration for which the safety performance characteristics are valid at rated conditions
of operation
3.12
functional insulation
insulation between conductive parts within a circuit, which is necessary for the proper
functioning of the circuit, but which does not provide protection against electric shock
3.13
high-voltage PDS
product with rated supply voltage between 1 kV and 35 kV a.c., 50 Hz or 60 Hz
NOTE These products fall into the scope of IEC 61800-4
3.14
installation
equipment or equipments including at least the PDS and the driven equipment (see
Figure 1)
NOTE The word “installation” is also used in this international standard to denote the process of installing a
PDS/CDM/BDM. In these cases, the word does not appear in italics.
3.15
integrated PDS
PDS where motor and CDM/BDM are mechanically integrated into a single unit
3.16
(earth) leakage current
current flowing from the live parts of the installation to earth, in the absence of an insulation
fault
[IEV 442-01-24]
3.17
live part
conductor or conductive part intended to be energized in normal use, including a neutral
conductor but not a protective earth neutral
3.18
low-voltage PDS
product with rated supply voltage up to 1 000 V a.c., 50 Hz or 60 Hz
NOTE These products fall into the scope of IEC 61800-1 or IEC 61800-2.
3.19
open type (product)
(product) intended for incorporation within enclosure or assembly which will provide access
protection
61800-5-1 © IEC:2007 – 13 –
3.20
power drive system
PDS
system for the speed control of an electric motor, including the CDM and motor but not the driven
equipment (see Figure 1)
3.21
protective ELV (PELV) circuit
electrical circuit with the following characteristics:
• the voltage does not continuously exceed ELV under single fault as well as normal
conditions;
• protective separation from circuits other than PELV or SELV;
• provisions for earthing of the PELV circuit, or its accessible conductive parts, or both
3.22
prospective short-circuit current
current which flows when the supply conductors to the circuit are short-circuited by a conductor
of negligible impedance located as near as possible to the supply terminals of the
PDS/CDM/BDM
3.23
protective bonding
electrical connection of conductive parts for safety purposes
3.24
protective class 0
equipment in which protection against electric shock relies only upon basic insulation
NOTE Equipment of this class becomes hazardous in the event of a failure of the basic insulation.
3.25
protective class I
equipment in which protection against electric shock does not rely on basic insulation only, but
which includes an additional safety precaution in such a way that means are provided for the
connection of accessible conductive parts to the protective (earthing) conductor in the fixed
wiring of the installation, so that accessible conductive parts cannot become live in the event of
a failure of the basic insulation
3.26
protective class II
equipment in which protection against electric shock does not rely on basic insulation only, but
in which additional safety precautions such as supplementary insulation or reinforced insulation
are provided, there being no provision for protective earthing or reliance upon installation
conditions
3.27
protective class III
equipment in which protection against electric shock relies on supply at ELV and in which
voltages higher than those of ELV are not generated and there is no provision for protective
earthing
[see IEC 61140, subclause 7.4]

– 14 – 61800-5-1 © IEC:2007
3.28
protective earthing (PE)
earthing of a point in a system, or equipment, for protection against electric shock in case of a
fault
3.29
protective earthing conductor
protective conductor provided for protective earthing
[IEV 195-02-11]
3.30
protective impedance
impedance connected between live parts and accessible conductive parts, of such value that
the current, in normal use and under likely fault conditions, is limited to a safe value, and which
is so constructed that its reliability is maintained throughout the life of the equipment
[IEV 442-04-24, modified]
3.31
protective screening
separation of circuits from hazardous live-parts by means of an interposed conductive screen,
connected to the means of connection for a protective earthing conductor
3.32
protective separation
separation between circuits by means of basic and supplementary protection (basic insulation
plus supplementary insulation or protective screening) or by an equivalent protective provision
(for example, reinforced insulation)
3.33
reinforced insulation
single insulation system, applied to live parts, which provides a degree of protection against
electric shock equivalent to double insulation under the conditions specified in the relevant
IEC standard
[IEC 60664-1: 1992, definition 1.3.17.5]
3.34
routine test
test to which each individual device is subjected during or after manufacture to ascertain
whether it complies with certain criteria
[IEV 151-16-17]
3.35
Safety ELV (SELV) circuit
electrical circuit with the following characteristics:
• the voltage does not exceed ELV;
• protective separation from circuits other than SELV or PELV;
• no provisions for earthing of the SELV circuit, or its accessible conductive parts;
• basic insulation of the SELV circuit from earth and from PELV circuits
3.36
sample test
test on a number of devices taken at random from a batch
[IEV 151-16-20, modified]
61800-5-1 © IEC:2007 – 15 –
3.37
supplementary insulation
independent insulation applied in addition to basic insulation in order to provide protection
against electric shock in the event of a failure of basic insulation
[IEC 60664-1: 1992, definition 1.3.17.3]
NOTE Basic and supplementary insulation are separate, each designed for basic protection against electric shock.
3.38
system voltage
voltage used to determine insulation requirements
NOTE See 4.3.6.2.1 for further consideration of system voltage.
3.39
temporary overvoltage
overvoltage at the supply frequency of relatively long duration
[IEC 60664-1:1992, definition 1.3.7.1, modified]
3.40
touch current
electric current passing through a human body or through an animal body when it touches one
or more accessible parts of an electrical installation or electrical equipment
[IEV 826-11-12]
3.41
type test
test of one or more devices made to a certain design to show that the design meets certain
specifications
[IEV 151-16-16, modified]
3.42
user terminal
terminal provided for external connection to the PDS/CDM/BDM
3.43
working voltage
voltage, at rated supply conditions (without tolerances) and worst case operating conditions,
which occurs by design in a circuit or across insulation
NOTE The working voltage can be d.c. or a.c. Both the r.m.s. and recurring peak values are used.
3.44
zone of equipotential bonding
zone where all simultaneously accessible conductive parts are electrically connected to prevent
hazardous voltages appearing between them
NOTE For equipotential bonding, it is not necessary for the parts to be earthed.

– 16 – 61800-5-1 © IEC:2007
Installation or part of installation
PDS (power drive system)
CDM (complete drive module)
System control and sequencing
BDM (basic drive module)
Converter section
Control section
Feeding section
Auxiliaries
Others
Motor and sensors
Driven equipment
IEC  1197/07
Figure 1 – PDS hardware configuration within an installation
4 Protection against electric shock, thermal, and energy hazards
4.1 General
This Clause 4 defines the minimum requirements for the design and construction of a PDS, to
ensure its safety during installation, normal operating conditions and maintenance for the
expected lifetime of the PDS. Consideration is also given to minimising hazards resulting from
reasonably foreseeable misuse.
Table 2 shows the application of the requirements of this Clause 4 to PDS, CDM or BDM.

61800-5-1 © IEC:2007 – 17 –
Table 2 – Relevance of requirements to PDS/CDM/BDM
a
CDM/B
Sub- Title PDS
clause DM
4.2 (Protection against electric shock, thermal, and energy hazards) - Fault conditions A A
4.3.1 Decisive voltage classification A A
4.3.2 Protective separation A A
4.3.3 Protection against direct contact A C
4.3.4 Protection in case of direct contact A C
4.3.5.1 (Protection against indirect contact) - General A A
4.3.5.2 Insulation between live parts and accessible conductive parts A C
4.3.5.3 A C
4.1.1.1 Protective bonding circuit

4.3.5.4 Protective earthing conductor A A
4.3.5.5 Means of connection for the protective earthing conductor A A
4.3.5.6 Special features in equipment for protective class II A C
4.3.6 Insulation A A
4.3.7 Enclosures A C
4.3.8 Wiring and connections A A
4.3.9 Output short-circuit requirements A A
4.3.10 Residual current-operated protective (RCD) or monitoring (RCM) device compatibility A C
4.3.11 Capacitor discharge A A
4.3.12 Access conditions for high-voltage PDS A C
4.4 Protection against thermal hazards A A
4.4.3 Flammability of enclosure materials A C
4.4.5 Specific requirements for liquid cooled PDS A A
4.5 Protection against energy hazards A A
4.5.2 Mechanical energy hazards A C
4.6 Protection against environmental stresses A A
A Requirement always relevant.
C Requirement relevant unless CDM or BDM is incorporated into an assembly that provides the required protection.
a
Integrated PDS shall meet the requirement for PDS.

4.2 Fault conditions
PDS shall be designed to avoid operating modes or sequences that can cause a fault condition
or component failure leading to a hazard, unless other measures to prevent the hazard are
provided by the installation.
...