Publishing Note

1 - AS/NZS 60950:2000 SAFETY OF INFORMATION TECHNOLOGY EQUIPMENT (IEC 60950:1999, MOD)
4 - PREFACE
6 - INTRODUCTION
6 - 0 Principles of safety
6 - 0.1 General principles of safety
7 - 0.2 Hazards
7 - 0.2.1 Electric shock
8 - 0.2.2 Energy related hazards
8 - 0.2.3 Fire
9 - 0.2.4 Heat related hazards
9 - 0.2.5 Mechanical hazards
9 - 0.2.6 Radiation
10 - 0.2.7 Chemical hazards
10 - 0.3 Materials and components
11 - CONTENTS
27 - 1 General
27 - 1.1 Scope
27 - 1.1.1 Equipment covered by this standard
28 - 1.1.2 Additional requirements
28 - 1.1.3 Exclusions
29 - 1.2 Definitions
30 - 1.2.1 Equipment electrical ratings
30 - 1.2.2 Operating conditions
31 - 1.2.3 Equipment mobility
31 - 1.2.4 Classes of equipment – Protection against electric shock
32 - 1.2.5 Connection to the supply
32 - 1.2.6 Enclosures
32 - 1.2.7 Accessibility
33 - 1.2.8 Circuits and circuit characteristics
35 - 1.2.9 Insulation
35 - 1.2.10 Clearances and creepage distances
35 - 1.2.11 Components
36 - 1.2.12 Flammability
37 - 1.2.13 Miscellaneous
38 - 1.3 General requirements
38 - 1.3.1 Application of requirements
38 - 1.3.2 Equipment design and construction
38 - 1.3.3 Supply voltage
39 - 1.3.4 Constructions not specifically covered
39 - 1.3.5 Equivalent materials
39 - 1.3.6 Orientation during transport and use
39 - 1.3.7 Choice of criteria
39 - 1.3.8 Examples mentioned in the standard
39 - 1.3.9 Conductive liquids
39 - 1.4 General conditions for tests
39 - 1.4.1 Application of tests
39 - 1.4.2 Type tests
39 - 1.4.3 Test samples
40 - 1.4.4 Operating parameters for tests
40 - 1.4.5 Supply voltage for tests
41 - 1.4.6 Supply frequency for tests
41 - 1.4.7 Electrical measuring instruments
41 - 1.4.8 Normal operating voltages
41 - 1.4.9 Measurement of voltage to earth
41 - 1.4.10 Loading configuration of the EUT
42 - 1.4.11 Power from a telecommunication network
42 - 1.4.12 Temperature measurement conditions
42 - 1.4.13 Temperature measurement methods
42 - 1.4.14 Simulated faults and abnormal conditions
43 - 1.5 Components
43 - 1.5.1 General
43 - 1.5.2 Evaluation and testing of components
43 - 1.5.3 Thermal controls
43 - 1.5.4 Transformers
44 - 1.5.5 Interconnecting cables
44 - 1.5.6 Capacitors in primary circuits
44 - 1.5.7 Double or reinforced insulation bridged by components
44 - 1.5.8 Components in equipment for IT power systems
45 - 1.6 Power interface
45 - 1.6.1 AC power distribution systems
45 - 1.6.2 Input current
45 - 1.6.3 Voltage limit of hand-held equipment
45 - 1.6.4 Neutral conductor
45 - 1.7 Markings and instructions
46 - 1.7.1 Power rating
47 - 1.7.2 Safety instructions
48 - 1.7.3 Short duty cycles
48 - 1.7.4 Supply voltage adjustment
48 - 1.7.5 Power outlets on the equipment
48 - 1.7.6 Fuse identification
48 - 1.7.7 Wiring terminals
49 - 1.7.8 Controls and indicators
50 - 1.7.9 Isolation of multiple power sources
50 - 1.7.10 IT power systems
50 - 1.7.11 Thermostats and other regulating devices
50 - 1.7.12 Language
50 - 1.7.13 Durability
50 - 1.7.14 Removable parts
51 - 1.7.15 Replaceable batteries
51 - 1.7.16 Operator access with a tool
51 - 1.7.17 Equipment for restricted access locations
51 - 2 Protection from hazards
51 - 2.1 Protection from electric shock and energy hazards
51 - 2.1.1 Protection in operator access areas
57 - 2.1.2 Protection in service access areas
57 - 2.1.3 Protection in restricted access locations
58 - 2.2 SELV circuits
58 - 2.2.1 General requirements
58 - 2.2.2 Voltages under normal conditions
58 - 2.2.3 Voltages under fault conditions
59 - 2.2.4 Connection of SELV circuits to other circuits
59 - 2.3 TNV circuits
59 - 2.3.1 Limits
61 - 2.3.2 Separation from other circuits and from accessible parts
61 - 2.3.3 Separation from hazardous voltages
62 - 2.3.4 Connection of TNV circuits to other circuits
62 - 2.3.5 Test for operating voltages generated externally
63 - 2.4 Limited current circuits
63 - 2.4.1 General requirements
63 - 2.4.2 Limit values
63 - 2.4.3 Connection of limited current circuits to other circuits
64 - 2.5 Limited power sources
65 - 2.6 Provisions for earthing and bonding
65 - 2.6.1 Protective earthing
66 - 2.6.2 Functional earthing
66 - 2.6.3 Protective earthing and protective bonding conductors
69 - 2.6.4 Terminals
70 - 2.6.5 Integrity of protective earthing
72 - 2.7 Overcurrent and earth fault protection in primary circuits
72 - 2.7.1 Basic requirements
72 - 2.7.2 Faults not covered in 5.3
72 - 2.7.3 Short-circuit backup protection
73 - 2.7.4 Number and location of protective devices
73 - 2.7.5 Protection by several devices
74 - 2.7.6 Warning to service personnel
74 - 2.8 Safety interlocks
74 - 2.8.1 General principles
74 - 2.8.2 Protection requirements
75 - 2.8.3 Inadvertent reactivation
75 - 2.8.4 Fail-safe operation
75 - 2.8.5 Interlocks with moving parts
75 - 2.8.6 Overriding an interlock
76 - 2.8.7 Switches and relays in interlock systems
76 - 2.8.8 Mechanical actuators
77 - 2.9 Electrical insulation
77 - 2.9.1 Properties of insulating materials
77 - 2.9.2 Humidity conditioning
77 - 2.9.3 Requirements for insulation
77 - 2.9.4 Insulation parameters
77 - 2.9.5 Categories of insulation
81 - 2.10 Clearances, creepage distances and distances through insulation
81 - 2.10.1 General
82 - 2.10.2 Determination of working voltage
83 - 2.10.3 Clearances
88 - 2.10.4 Creepage distances
90 - 2.10.5 Solid insulation
93 - 2.10.6 Coated printed boards
96 - 2.10.7 Enclosed and sealed parts
97 - 2.10.8 Spacings filled by insulating compound
97 - 2.10.9 Component external terminations
98 - 2.10.10 Insulation with varying dimensions
98 - 3 Wiring, connections and supply
98 - 3.1 General
98 - 3.1.1 Current rating and overcurrent protection
98 - 3.1.2 Protection against mechanical damage
98 - 3.1.3 Securing of internal wiring
98 - 3.1.4 Insulation of conductors
99 - 3.1.5 Beads and ceramic insulators
99 - 3.1.6 Screws for electrical contact pressure
99 - 3.1.7 Non-metallic materials in electrical connections
100 - 3.1.8 Self-tapping and spaced thread screws
100 - 3.1.9 Termination of conductors
101 - 3.1.10 Sleeving on wiring
101 - 3.2 Connection to a.c. mains supplies
101 - 3.2.1 Means of connection
101 - 3.2.2 Multiple supply connections
101 - 3.2.3 Permanently connected equipment
102 - 3.2.4 Appliance inlets
102 - 3.2.5 Power supply cords
105 - 3.2.6 Cord anchorages and strain relief
106 - 3.2.7 Protection against mechanical damage
107 - 3.2.8 Cord guards
107 - 3.2.9 Supply wiring space
107 - 3.3 Wiring terminals for connection of external conductors
108 - 3.3.1 Wiring terminals
108 - 3.3.2 Connection of non-detachable power supply cords
108 - 3.3.3 Screw terminals
108 - 3.3.4 Conductor sizes to be connected
109 - 3.3.5 Wiring terminal sizes
109 - 3.3.6 Wiring terminal design
110 - 3.3.7 Grouping of wiring terminals
110 - 3.3.8 Stranded wire
110 - 3.4 Disconnection from the a.c. mains supply
110 - 3.4.1 General requirement
111 - 3.4.2 Disconnect devices
111 - 3.4.3 Permanently connected equipment
111 - 3.4.4 Parts which remain energized
111 - 3.4.5 Switches in flexible cords
111 - 3.4.6 Single-phase equipment
112 - 3.4.7 Three-phase equipment
112 - 3.4.8 Switches as disconnect devices
112 - 3.4.9 Plugs as disconnect devices
112 - 3.4.10 Interconnected equipment
112 - 3.4.11 Multiple power sources
112 - 3.5 Interconnection of equipment
112 - 3.5.1 General requirements
113 - 3.5.2 Types of interconnection circuits
113 - 3.5.3 ELV circuits as interconnection circuits
113 - 4 Physical requirements
113 - 4.1 Stability
114 - 4.2 Mechanical strength
114 - 4.2.1 General
114 - 4.2.2 Steady force test, 10 N
115 - 4.2.3 Steady force test, 30 N
115 - 4.2.4 Steady force test, 250 N
115 - 4.2.5 Impact test
116 - 4.2.6 Drop test
116 - 4.2.7 Stress relief
117 - 4.2.8 Cathode ray tubes
117 - 4.2.9 High pressure lamps
117 - 4.2.10 Wall or ceiling mounted equipment
117 - 4.3 Design and construction
117 - 4.3.1 Edges and corners
117 - 4.3.2 Handles and manual controls
118 - 4.3.3 Adjustable controls
118 - 4.3.4 Securing of parts
118 - 4.3.5 Connection of plugs and sockets
118 - 4.3.6 Direct plug-in equipment
119 - 4.3.7 Heating elements in earthed equipment
119 - 4.3.8 Batteries
120 - 4.3.9 Oil and grease
120 - 4.3.10 Dust, powders, liquids and gases
121 - 4.3.11 Containers for liquids or gases
121 - 4.3.12 Flammable liquids
122 - 4.3.13 Radiation
122 - 4.4 Protection against hazardous moving parts
122 - 4.4.1 General
122 - 4.4.2 Protection in operator access areas
123 - 4.4.3 Protection in restricted access locations
123 - 4.4.4 Protection in service access areas
123 - 4.5 Thermal requirements
123 - 4.5.1 Temperature rises
125 - 4.5.2 Resistance to abnormal heat
125 - 4.6 Openings in enclosures
125 - 4.6.1 Top and side openings
128 - 4.6.2 Bottoms of fire enclosures
130 - 4.6.3 Doors or covers in fire enclosures
131 - 4.6.4 Openings in transportable equipment
131 - 4.6.5 Adhesives for constructional purposes
132 - 4.7 Resistance to fire
132 - 4.7.1 Reducing the risk of ignition and spread of flame
132 - 4.7.2 Conditions for a fire enclosure
133 - 4.7.3 Materials
138 - 5 Electrical requirements and simulated abnormal conditions
138 - 5.1 Touch current and protective conductor current
138 - 5.1.1 General
139 - 5.1.2 Equipment under test (EUT)
139 - 5.1.3 Test circuit
141 - 5.1.4 Application of measuring instrument
141 - 5.1.5 Test procedure
141 - 5.1.6 Test measurements
142 - 5.1.7 Equipment with touch current exceeding 3,5 mA
143 - 5.1.8 Touch currents to and from telecommunication networks
145 - 5.2 Electric strength
145 - 5.2.1 General
145 - 5.2.2 Test procedure
148 - 5.3 Abnormal operating and fault conditions
148 - 5.3.1 Protection against overload and abnormal operation
148 - 5.3.2 Motors
148 - 5.3.3 Transformers
148 - 5.3.4 Functional insulation
149 - 5.3.5 Electromechanical components
149 - 5.3.6 Simulation of faults
150 - 5.3.7 Unattended equipment
150 - 5.3.8 Compliance criteria for abnormal operating and fault conditions
151 - 6 Connection to telecommunication networks
151 - 6.1 Protection of telecommunication network service personnel, and users of other equipment connected to the network, from...
151 - 6.1.1 Protection from hazardous voltages
151 - 6.1.2 Separation of the telecommunication network from earth
153 - 6.2 Protection of equipment users from overvoltages on telecommunication networks
153 - 6.2.1 Separation requirements
153 - 6.2.2 Electric strength test procedure
156 - 6.3 Protection of the telecommunication wiring system from overheating
157 - Annex A - Tests for resistance to heat and fire
157 - A.1 Flammability test for fire enclosures of movable equipment having a total mass exceeding 18 kg, and of stationary...
158 - A.2 Flammability test for fire enclosures of movable equipment having a total mass not exceeding 18 kg, and for material...
159 - A.3 High current arcing ignition test (see 4.7.3.2)
160 - A.4 Hot wire ignition test (see 4.7.3.2)
161 - A.5 Hot flaming oil test (see 4.6.2)
162 - A.6 Flammability tests for classifying materials V-0, V-1 or V-2
163 - A.7 Flammability test for classifying foamed materials HF-1, HF-2 or HBF
165 - A.8 Flammability test for classifying materials HB
166 - A.9 Flammability test for classifying materials 5V
168 - A.10 Stress relief conditioning (see 4.2.7)
169 - Annex B - Motor tests under abnormal conditions (see 4.7.2.2 and 5.3.2)
169 - B.1 General requirements
169 - B.2 Test conditions
169 - B.3 Maximum temperatures
171 - B.4 Running overload test
171 - B.5 Locked-rotor overload test
172 - B.6 Running overload test for d.c. motors in secondary circuits
172 - B.7 Locked-rotor overload test for d.c. motors in secondary circuits
173 - B.8 Test for motors with capacitors
173 - B.9 Test for three-phase motors
173 - B.10 Test for series motors
174 - Annex C - Transformers (see 1.5.4 and 5.3.3)
174 - C.1 Overload test
175 - C.2 Insulation
177 - Annex D - Measuring instruments for touch-current tests (see 5.1.4)
177 - D.1 Measuring instrument
178 - D.2 Alternative measuring instrument
179 - Annex E - Temperature rise of a winding (see 1.4.13 and 4.5.1)
180 - Annex F - Measurement of clearances and creepage distances (see 2.10)
187 - Annex G - Alternative method for determining minimum clearances
187 - G.1 Summary of the procedure for determining minimum clearances
187 - G.2 Determination of mains transient voltage
188 - G.3 Determination of telecommunication network transient voltage
188 - G.4 Determination of required withstand voltage
189 - G.5 Measurement of transient levels
190 - G.6 Determination of minimum clearances
192 - Annex H - Ionizing radiation (see 4.3.13)
193 - Annex J - Table of electrochemical potentials (see 2.6.5.6)
194 - Annex K - Thermal controls (see 1.5.3 and 5.3.7)
194 - K.1 Making and breaking capacity
194 - K.2 Thermostat reliability
194 - K.3 Thermostat endurance test
194 - K.4 Temperature limiter endurance
195 - K.5 Thermal cut-out reliability
195 - K.6 Stability of operation
196 - Annex L - Normal load conditions for some types of electrical business equipment (see 1.2.2.1 and 4.5.1)
196 - L.1 Typewriters
196 - L.2 Adding machines and cash registers
196 - L.3 Erasers
196 - L.4 Pencil sharpeners
196 - L.5 Duplicators and copy machines
196 - L.6 Motor-operated files
197 - L.7 Other business equipment
198 - Annex M - Criteria for telephone ringing signals
198 - M.1 Introduction
198 - M.2 Method A
200 - M.3 Method B
202 - Annex N - Impulse test generators (see 2.10.3.4, 6.2.2.1 and G.5)
203 - Annex P - Normative references
206 - Annex Q - Bibliography
207 - Annex R - Examples of requirements for quality control programmes
207 - R.1 Minimum separation distances for unpopulated coated printed boards (see 2.10.6)
208 - R.2 Reduced clearances (see 2.10.3)
210 - Annex S - Procedure for impulse testing (see 6.2.2.3)
210 - S.1 Test equipment
210 - S.2 Test procedure
210 - S.3 Examples of waveforms during impulse testing
212 - Annex T - Guidance on protection against ingress of water (see 1.1.2)
214 - Annex U - Insulated winding wires for use without interleaved insulation (see 2.10.5.4)
214 - U.1 Wire construction
214 - U.2 Type tests
215 - U.3 Tests during manufacture
216 - Annex V - AC power distribution systems (see 1.6.1)
216 - V.1 Introduction
217 - V.2 TN power systems
220 - V.3 TT power systems
221 - V.4 IT power systems
223 - Annex W - Summation of touch currents
223 - W.1 Touch current from electronic circuits
224 - W.2 Interconnection of several equipments
226 - Annex X - Maximum heating effect in transformer tests (see C.1)
226 - X.1 Determination of maximum input current
227 - X.2 Overload test procedure
228 - Annex ZZ - Variations to IEC 60950:1999 for application in Australia and New Zealand
228 - ZZ.1 Introduction
228 - ZZ.2 Variations
231 - Annex YY - Resistance to fire
234 - INDEX
273 - AMENDMENT CONTROL SHEET

Specifies requirements for the safety of information technology equipment including electrical business equipment and associated equipment, with a rated voltage not exceeding 600V. Specifies requirements intended to ensure safety for the operator and layman who may come into contact with the equipment and, where specifically stated, for service personnel. This Standard is an adoption with national modifications and contains the whole text of IEC 60950:1999.

1.1.1 Equipment covered by this standardThis standard is applicable to mains-powered or battery-powered information technology equipment, including electrical business equipment and associated equipment, with a RATED VOLTAGE not exceeding 600 V.This standard is also applicable to such information technology equipment designed and intended to be connected directly to a TELECOMMUNICATION NETWORK, regardless of the source of power.It is also applicable to such information technology equipment designed to use the AC MAINS SUPPLY as a telecommunication transmission medium (see note 4 of clause 6).This standard specifies requirements intended to reduce risks of fire, electric shock or injury for the OPERATOR and layman who may come into contact with the equipment and, where specifically stated, for SERVICE PERSONNEL.This standard is intended to reduce such risks with respect to installed equipment, whether it consists of a system of interconnected units or independent units, subject to installing, operating and maintaining the equipment in the manner prescribed by the manufacturer.Examples of equipment which is in the scope of this standard are:accounting machinesbookkeeping machinescalculatorscash registerscopying machinesdata circuit terminating equipmentdata preparation equipmentdata processing equipmentdata terminal equipmentdictation equipmentdocument shredding machinesduplicatorselectrically operated drawing machineserasersfacsimile equipmentkey telephone systemsmagnetic tape handlersmail processing machinesmicrographic office equipmentmodemsmonetary processing machines including automated teller (cash dispensing) machinesmotor-operated filesPABX'spaper jogging machinespaper trimmers (punchers, cutting machines, separators)pencil sharpenerspersonal computersphotoprinting equipmentplotterspoint of sale terminals including associated electronic scalespostage machinespublic information terminalsstaplerstelephone answering machinestelephone setstext processing equipmenttypewritersvisual display unitsThis list is not intended to be comprehensive, and equipment that is not listed is not necessarily excluded from the scope. Equipment complying with the relevant requirements in this standard is consideredsuitable for use with process control equipment, automatic test equipment and similar systems requiring information processing facilities. However, this standard does not include requirements for performance orfunctional characteristics of equipment.1.1.2 Additional requirementsRequirements additional to those specified in this standard may be necessary for: equipment intended for operation in special environments, for example, extremes of temperature; excessive dust, moisture or vibration; flammable gases; and corrosive or explosive atmospheres; electromedical applications with physical connections to the patient; equipment intended to be used in vehicles, on board ships or aircraft, in tropicalcountries, or at altitudes greater than 2 000 m; equipment intended for use where ingress of water is possible; for guidance on such requirements and on relevant testing, see annex T.NOTE Attention is drawn to the fact that authorities of some countries impose additional requirements.1.1.3 ExclusionsThis standard does not apply to: support equipment, such as air conditioning, fire detection or fire extinguishing systems; power supply systems, such as motor-generator sets, battery backup systems and transformers, which are not an integral part of the equipment; building installation wiring; devices requiring no electric power.

First published in Australia as AS 3260-1988.First published in New Zealand as NZS 6600:1989.NZS 6600:1987 revised and redesignated as NZS 6661:1989.AS 3260-1988 and NZS 6661:1989 revised, amalgamated and redesignated as AS/NZS 3260:1993.AS/NZS 3260:1993 revised and redesignated as AS/NZS 60950:2000. First published in Australia as AS 3260-1988. First published in New Zealand as NZS 6600:1989. NZS 6600:1987 revised and redesignated as NZS 6661:1989. AS 3260-1988 and NZS 6661:1989 revised, amalgamated and redesignated as AS/NZS 3260:1993. AS/NZS 3260:1993 revised and redesignated as AS/NZS 60950:2000.