I would like to install a security light on the outside of my garage. The
only electricity in that area is an electric outlet on the inside of the
garage wall. Can I tap into the inside wall outlet to connect a switch and a
light? Or, can I put a light only on a dedicated lighting circuit?
Depends on how strictly your inspector wants to interpret the code.
Technically, you're not supposed to have lighting and receptacles on
same circuit. The theory is that if you're using something like an
iron or soldering gun and overload the circuit, you could also burn
yourself as you tried to leave a dark room. I suppose the inspector
could argue that if you ran an extension cord outside the garage and
used it to power a saw while your work area was lit by your security
light, you could saw your hand off as the blade powered down after
overloading the circuit.
Just because they never did it that way in the past doesn't mean
you're grandfathered in. Any time you make an electrical improvement
on a circuit, that improvement is supposed to be up to the current
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