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.

The 80% rule is for continuous loads - over 3 hours.

--
bud--

In alt.engineering.electrical bud-- wrote:
| 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.
|
| The 80% rule is for continuous loads - over 3 hours.

Like a computer?

--
|WARNING: Due to extreme spam, googlegroups.com is blocked. Due to ignorance |
| by the abuse department, bellsouth.net is blocked. If you post to |
| Usenet from these places, find another Usenet provider ASAP. |
| Phil Howard KA9WGN (email for humans: first name in lower case at ipal.net) |

"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"


The 80% rule is for continuous loads - over 3 hours.

--
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.


--
bud--

? "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