"Tony Hwang" wrote in message
news:sywnb.206443$pl3.17868@pd7tw3no...


Doug Miller wrote:

In article C4bnb.197307$pl3.160437@pd7tw3no, Tony Hwang
wrote:


Doug Miller wrote:


In article Wl3nb.194451$9l5.193936@pd7tw2no, Tony Hwang


wrote:

Tom Horne wrote:


As long as the lamps are incandescent the wattage of the
lamps can be used as the VA of the lamps.


VA is not equal to Watts. Reason? Power factor, Cosine Phi.
As far as math is concerned.


As far as a purely resistive load such as an incandescent lamp is
concerned,
they are indeed equal.


Hi,
Since you used word PURELY, even the filament of incandescent bulb has
inductance, how could it be pure R without X? I still stick my gun on
my statement. Watts is not equal to VA, better give some margin.
Tony


OK, why don't you do the math, and tell us how much difference there is
between watts and volt-amperes for, say, a 60-watt incandescent light
bulb?

--
Regards,
Doug Miller (alphageek-at-milmac-dot-com)
Hi,
Also wiring has inductance. If I install 15A circuit, I'd let it carry
~13A and have peace in mind. Are you going to give full load in your
case then?
Tony


Tony, your argument holds about as much water as a tiny piece of pork (fat)
in a can of "Pork" and Beans.......interesting how the pork is always listed
_first_.

The reason why the NEC limits a continuously loaded lighting circuit
(defined by the NEC as a circuit expected to remain on for 3 or more hours)
to 80% (that's 12 amps for a 15 amp circuit) is because the circuit breaker
will start to nuisance trip when left on for an extended period of time if
the full 15 amps is applied continuously, _not_ some ridiculous argument
about the minuscule amount of inductance in an incandescent lamp.