DOE and the NEC, require the use of flame-retardant electrical cables in buildings. Specifically, cables installed in open cable trays, building vertical shafts (risers), and air plenums must have a flame-retardant outer jacket.
The extra-flexible cables AWG #2 and AWG #12 with the transparent covers designed for use with ground hooks (Stock Nos. 6145-51726 and 6145-71376, respectively) are not rated for use in plenums, risers, or trays.
All Laboratory research divisions and support groups are responsible for ensuring that properly rated and listed cables are used in installations where the cable is exposed in cable trays, air plenums, building risers, or in experimental areas. For assistance with the wiring of research equipment, contact Electronics Engineering.
Provide a lockable means of positively disconnecting the input on large power supplies (most Class 2A, 3A, 3B, or 4B rated units; see Hazard Class Charts in Sections 8.7.3.1 and 8.7.3.2). This disconnect must be clearly marked and accessible.
If provided with a built-in lock that is part of an interlock chain, the key must not be removable unless the switch or breaker is in the “off” position.
Overload protection must be provided on the input and should be provided on the output.
Some research equipment (e.g., electrophoresis devices, x-ray tubes, and ion-bombardment power supplies) employs ungrounded (floating) power supplies. This equipment may operate in voltages ranging from 50V to kilovolts, with output capacities in excess of 50mA, and must be considered a lethal electrical hazard. Users of such equipment must take special precautions to minimize electrical hazards. Follow all manufacturers’ instructions for equipment use, testing, and training. The following general guidelines also apply:
This appendix is in engineering review.
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