In North America, orange outlets are normally isolated ground outlets. The
color does not signify the voltage. Only the outlet pin configuration is
used to determine the voltage.
On most North American outlets, the ground connection on the outlet is
connected to the outlet mounting frame.
I did a search of the 1999 NEC and this is the closest I can find.
410-56, (c) Isolated Ground Receptacles. Receptacles intended for the
reduction of electrical noise (electromagnetic interference) as permitted in
Section 250-146(d) shall be identified by an orange triangle located on the
face
I'm not sure, but I believe the orange outlets mean that the outlet is
protected with backup power, e.g., a generator, in case of lost power from the
grid. I've seen these in hospitals. I don't know if it's in the NEC or not.
Anyone?
Regards,
John Kretsch
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