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GB 4793.1-2007: Safety requirements for electrical equipment for measurement, control, and laboratory use -- Part 1: General requirements
GB 4793.1-2007
ICS 19.080; 71.040.10
L 09
GB
National Standard
of the People’s Republic of China
GB 4793.1-2007 / IEC 61010-1.2001
Replacing GB 4793.1-1995
Safety requirements for electrical equipment
for measurement, control, and laboratory use -
Part 1. General requirements
(IEC 61010-1.2001, IDT)
ISSUED ON. JUNE 7, 2007
IMPLEMENTED ON. SEPTEMBER 1, 2007
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 9 
Introduction ... 12 
1 Scope and object ... 13 
1.1 Scope ... 13 
1.1.1 Equipment included in scope ... 13 
1.1.2 Equipment excluded from scope ... 13 
1.1.3 Computing equipment ... 14 
1.2 Object ... 14 
1.2.1 Aspects included in scope ... 14 
1.2.2 Aspects excluded from scope ... 14 
1.3 Verification... 15 
1.4 Environmental conditions ... 15 
1.4.1 Normal environmental conditions ... 15 
1.4.2 Extended environmental conditions ... 15 
2 Normative references ... 16 
3 Terms and definitions ... 17 
3.1 Equipment and states of equipment ... 17 
3.2 Parts and accessories ... 18 
3.3 Electrical quantities ... 19 
3.4 Tests ... 19 
3.5 Safety terms ... 20 
3.6 Insulation ... 22 
4 Tests ... 23 
4.1 General ... 23 
4.2 Sequence of tests ... 24 
4.3 Reference test conditions ... 24 
4.3.1 Environmental conditions ... 24 
4.3.2 State of equipment ... 24 
4.4 Testing in SINGLE FAULT CONDITION ... 26 
4.4.1 General ... 26 
4.4.2 Application of fault conditions ... 27 
4.4.3 Duration of tests ... 30 
4.4.4 Conformity after application of fault conditions ... 30 
5 Marking and documentation ... 31 
5.1 Marking ... 31 
5.1.1 General ... 31 
5.1.2 Identification ... 32 
5.1.3 MAINS supply ... 32 
5.1.4 Fuses ... 34 
5.1.5 TERMINALS, connections and operating devices ... 35 
5.1.6 Switches and circuit-breakers ... 36 
5.1.7 Equipment protected by DOUBLE INSULATION or REINFORCED INSULATION . 37 
5.1.8 Field-wiring TERMINAL boxes ... 37 
5.2 Warning markings ... 37 
5.3 Durability of markings ... 38 
5.4 Documentation ... 38 
5.4.1 General ... 38 
5.4.2 Equipment RATINGS ... 39 
5.4.3 Equipment installation ... 39 
5.4.4 Equipment operation ... 40 
5.4.5 Equipment maintenance ... 41 
6 Protection against electric shock ... 41 
6.1 General ... 41 
6.1.1 Requirements ... 41 
6.1.2 Exceptions ... 41 
6.2 Determination of ACCESSIBLE parts ... 42 
6.2.1 Examination ... 42 
6.2.2 Openings above parts that are HAZARDOUS LIVE ... 43 
6.2.3 Openings for pre-set controls ... 43 
6.3 Permissible limits for ACCESSIBLE parts ... 43 
6.3.1 Values in NORMAL CONDITION ... 43 
6.3.2 Values in SINGLE FAULT CONDITION ... 44 
6.4 Protection in NORMAL CONDITION ... 46 
6.5 Protection in SINGLE FAULT CONDITION ... 47 
6.5.1 PROTECTIVE BONDING ... 47 
6.5.2 DOUBLEIN SULATION and REINFORCED INSULATION ... 52 
6.5.3 PROTECTIVE IMPEDANCE ... 52 
6.5.4 Automatic disconnection of the supply ... 52 
6.6 Connections to external circuits ... 53 
6.6.1 General ... 53 
6.6.2 TERMINALS for external circuits ... 54 
6.6.3 Circuits with TERMINALS which are HAZARDOUS LIVE ... 54 
6.6.4 ACCESSIBLE TERMINALS for stranded conductors ... 54 
6.7 CLEARANCES and CREEPAGE DISTANCES ... 55 
6.7.1 General requirements... 55 
6.7.2 MAINS CIRCUITS ... 57 
6.7.3 Circuits other than MAINS...