? "bud--" ?????? ??? ??????
...
A. K. SEPUT wrote:
"bud--" wrote in message
.. .
Daniel Who Wants to Know wrote:
Also I am no expert here but I think intermittent loads can exceed the
80% rule hence the 14 gauge cord which would normally only be good for
15 amps but is protected by a 20 amp fuse inside the oven and a 20 amp
double pole circuit breaker in the service panel.
.
The US NEC allows about any cord of 2 conductors (not including ground)
to be used at 18A. Most (all?) cords with type starting H (hard use) can
be used at 20A.

"for short period and with limited lenght"
.
I see neither limitation in the US NEC.
.
The 80% rule is for continuous loads - over 3 hours.


--
Correct. #14 is the same as Europe's 4 mm^2-which we usually use here in
Greece for the regular, 4 kW hot water heaters. It's rated for 20 A
continuous duty when in a conduit with 1 live conductor (IIRC), we don't
have extensions in that gauge. We usually protect it with an 20 A circuit
breaker (single pole, aka automatic fuse) and a double pole circuit breaker
(aka switch) which is not automatic, just to turn on off the water heater.
There are 3kW heating elements, too, for older installations, which are
quite incapable of sustaining a 4kW load.



--
Tzortzakakis Dimitrios
major in electrical engineering
mechanized infantry reservist
hordad AT otenet DOT gr