Quantcast Power transfer and bypass switches

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MIL-HDBK-419A
Power transfer and bypass switches. If the facility contains power transfer and/or bypass switches,
c.
perform the following for each switch:
(1)
Verify that an identified conductor, if used, is brought into the switch from each power source.
Verify that the identified conductors are not grounded within the switch.
(2)
(3)
Verify that the identified conductors are white or natural gray. If larger than No. 6 AWG and
of another color (not green), it should be reidentified white or natural gray with paint or tape or by other means
such as tags or labels.
Verify that all raceways, conduits, enclosures, etc., are adequately grounded.
(4)
(5)
Verify the phase, identified and grounding conductors brought into the switch from each source
are routed together.
(6)
Verify that output phase, identified and grounding conductors are routed together.
Power panels. For power panels, excluding service entrance, verify the conditions listed below. In
d.
some instances, steps 11 through 14 may be more readily accomplished by working back from the equipment or
load end.
(1)
Verify that the phase, identified and equipment grounding conductors are routed into the panel
together through the same conduit, raceway, cable, etc.
Verify that the identified conductor is connected to the neutral bus.
(2)
(3)
Verify that the neutral bus is not grounded.
(4)
Verify that all wires connected to the neutral bus are white or natural gray or if larger than a
No. 6 AWG and of a different color, not green, have been reidentified with white or natural gray paint or tape
or by other means such as tags or labels.
(5)
Verify that no green, white or natural gray wires are used as phase conductors, or if white (but
not green), have been reidentified with paint, tape, tags, or labels.
(6)  If an equipment grounding conductor is a separate conductor brought into the panel, verify
that it is bare, or if insulated, that it is green, or green with one or more stripes, or if larger than a No. 6 AWG
and of another color, not white, it has been reidentified with paint, tape, or tags.
(7)  If the equipment grounding conductor is an insulated or bare wire, verify that it is connected
either to the ground bus or if the bus does not exist, that it is connected to the frame of the panel with
UL-approved connectors.
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