Robert G. Brown wrote:
As I'm working up a server room and some UPS's, a question arises. The
APC units we have have a different plug and current rating from the
circuits in the wall. In particular, we have L6-30R receptacles and the
APC requires only 20A. I had thought that it would be perfectly safe to
replace an L5-20P with an L6-30P and plug a 2200 VA UPS into a 30 amp
circuit, but the electrician who was doing some of the rewiring said "we
can't do that" because "the 30A circuit breaker might not blow in time
to protect" the 2200 VA device from damage in the event of an internal
short.
This argument seems quite senseless to me. If this argument were
correct we could never plug a 15 A device into a 20 A circuit, etc. It
would really simplify my life if I can just rehead the cable. Do any of
the electricity-savvy people here have any comments regarding the safety
or legality of doing so? I have always assumed that going up a size in
circuit capacity is generally safe and legal...
I'm planning to do the rewiring of cables today soon, so if you know
something about his please respond "soon".
rgb
The code says that a single receptacle on a circuit must have a rating
at least
as high as the circuit breaker, so you can't change the receptacles to
L5-20R's
unless you change the breakers too.
Here's an adapter that does what you want.
http://www.stayonline.com/detail.aspx?ID=3105
Counting labor, it might be cheaper than rewiring the cords.
-L
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