Code Change Summary: Additional language was added to ensure that specific equipment fed from more than one feeder is properly identified.

In the 2011 NEC^® code cycle, rules were added to require switchboards and panelboards (other than one- or two-family dwellings) to be marked to indicate where the panelboard receives its power. That way, anyone walking up to the panel can see the label and instantly know where to go to shut it off. It just makes sense.

When the 2011 code language was added, it left a few grey areas and “what-ifs”.

Question: What if the panelboard is supplied by a normal source of power and an alternate standby power source like a generator? Shouldn’t the marking identify all power sources supplying the panelboard?

Answer: Yes.

Question: How about switchgear? Shouldn’t the marking requirements apply to switchgear also?

Answer: Yes.

In the 2014 NEC^®, switchgear was added as well as the word “each”. Now, switchboards, switchgear, and panelboards supplied by feeders in other than one- or two-family dwellings must be marked to indicate each device or equipment where the power originates.

Below is a preview of the NEC^®.  See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on the “free access” tab and select the applicable year of NFPA 70 (National Electrical code).