Quote:
Originally Posted by user181
While grounding is certainly important, it will have no bearing on a noisy switched-mode power supply (SMPS).
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There's been a trend for many years to provide an isolated ground for computers and similar equipment. It's not dependent on the raceway or the BX cable armor. It requires a separate ground conductor going back to the service panel ground bus. The bright orange receptacles you see in some locations are isolated ground receptacles.