Keysight 34921A-34925A User’s Guide 69
External Wiring for Hazardous Voltages:
To ensure minimum safety insulation when wiring with hazardous voltages,
ensure all wiring (both internal and external to the instruments):
– follow (USA) NFPA 79 Table 12.5.1 Conductor Ampacity and 12.5.5(a)
Ambient Temperature Correction Factors (or equivalent National Code
requirements) when selecting the AWG required.
– are rated for at least 2 x the maximum applied voltage of the external
source or any interconnecting system modules or external connections.
– flame rated minimum:
– Wires and cables with overall cross-sectional area of the conductors
exceeding 0.5mm
2
meet test of IEC 60332-1-2 (IEC); or
– Wires and cables with overall cross-sectional area of the conductors
of 0.5mm
2
or less, the test of IEC 60332-2-2 (IEC); or
– FT-1 of CSA C22.2 No. 0.3 (Canada); or
– VW-1 of UL 1581 (US).
– temperature rated for the application.
– classified and suitable to be used external to the enclosure:
– AWM Class II B or A/B – external/interconnecting wires (single- or
multiple-conductor constructions with a jacket) and potentially
subject to mechanical abuse (Canada)
– AWM Style Use – external interconnection of electronic equipment or
appliances (US)
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