TO: NECA 400-200X ANSI Canvass Participants FROM: Billie Zidek ...

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NECA 400-200X – Reballot Draft
5. Energizing the Switchboard
WARNING: Arc flash, arc blast, and shock hazards exist when energizing
switchboards. Switchboards should only be energized by qualified persons,
following work practiced defined in the NFPA 70E.
Hazards exist in energizing a switchboard; energizing should only be
performed by qualified electrical personnel.
If a short circuit or ground-fault condition exists, caused by damage or poor
installation practices, and this is not detected and corrected during the check-out
procedures, serious personal injury and/or damage to the switchboard can result
when the switchboard is first energized. Follow the steps below to energize the
switchboards; read all steps before proceeding.
Step 1 Turn off all downstream loads. No load should be on the
switchboard when it is first energized.
Step 2 Use remote operators, if available, to close devices and energize
switchboards and loads for the first time.
Step 3 Prior to energizing any circuit that supplies rotating machinery,
verify that the phase sequence is correct. Serious damage can
result to motors and similar equipment rotating in the wrong
direction.
Step 4 One by one, close each circuit breaker or fusible switch in the
switchboard.
Step 5 Proceed to energize (turn on) the downstream loads (lighting
circuits, contactors, heaters, motors, etc.) one at a time.
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