Hi Joe,
Don't forget embedded power sources:
9.6.2 Embedded Power Sources
R9-9 [81] Embedded dc power sources (those contained within the equipment
being powered) with rated output of greater than 150 watts shall be
grounded. Where multiple sources have parallel outputs, the rated output
is considered to be the sum of the rated outputs of all individual sources
that are in parallel. Embedded dc power sources with a rated output of 150
watts or less and containing output power limiting (e.g., "fold-back"
output V-I characteristic), and conforming to the short-circuit
requirements of Section 9.8.1, R9-20, need not be grounded. The required
grounding shall consist of connecting the output terminal that is
designated to be grounded to the equipment frame or to a ground bus,
backplane layer, or other connection means that is bonded to the
equipment frame. To the greatest extent practicable, the grounding
location should be at the immediate output of the power source. Grounding
at the load or between the immediate output and the load is permitted as
necessary. Embedded power sources located within IBN equipment
frames shall be grounded in accordance with TR-NWT-000295.
John
