I'm adding a new bathroom in the basement, and the spot where it is is
quite a far run from the service panel.
There are no existing circuits in that section of the basement that I
would want to add the light, exhaust fan, and GFCI to.
Is it within NEC guidelines to run a separate 20 amp circuit to the
bathroom, and run the light above the sink, the exhaust fa, and a GFCI
receptaple on the same circuit?
The "loophole" for the code for baths is that the 20A circuit can
serve the outlets in more than one bath, but only the outlets, not the
lights or anything else. Just had this at my own house where we are
adding 1 1/2 baths. The 20A circuit feeds from the upstairs full bath
to the outlet in the 1/2 bath underneath it.
It can be done two ways: One dedicated circuit can serve "one" entire
bathroom, lights, fans, outlets, etc. or one dedicated 20 amp circuit can
serve multiple bathroom receptacle outlets only, and the lights, fans, etc,
can be run on whatever lighting circuits are available
He/She can do it two different ways and still be in full compliance with
the US NEC. One is a single twenty ampere circuit serves only the basin
receptacle outlets in one or more bathrooms. The other is that the
twenty ampere circuit can serve the receptacle outlet in one bathroom
only as well as other loads in the same bathroom. Both approaches are
allowed but you cannot combine them. I prefer to run one dedicated
twenty ampere circuit to each bathroom basin receptacle outlet. Since
the hairdryers that are used today take the entire ampacity of a fifteen
ampere circuit to run them a second hair dryer would push a twenty
ampere circuit over the trip point of it's breaker. If I do what the
code allows and run two different bathroom's basin receptacle outlets
from the same twenty ampere circuit then one hair dryer in each would
trip the circuit. If the bathroom has auxiliary heat I use a multi wire
branch circuit to supply the heater and the basin receptacle outlet. If
future code changes require the use of AFCIs in bathroom circuits I'll
just run dual circuit cable instead. Leaving at least one light in the
bathroom on the general lighting circuit so that the tripping of a
receptacle circuit will not plunge the room into darkness is my idea of
good practice and common sense.
"This alternating current stuff is just a fad. It is much too dangerous
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