15 Jan
2009
15 Jan
'09
12:10 p.m.
>>>> "Sridhar" == Sridhar Ayengar
<ploopster at gmail.com> writes:
Sridhar> Ethan Dicks wrote:
> On Thu, Jan 15, 2009 at 2:03 PM, Gordon JC Pearce
MM3YEQ
> <gordonjcp at gjcp.net> wrote:
>> On Wed, 2009-01-14 at 15:19 -0500, Ethan Dicks wrote:
>>
>>> That and I don't have adequate electric service to the place
>>> without upgrading the pole. I've got 100A for the house and
>>> quonset hut *combined*.
>> 24kW should be enough for anyone ;-)
>>
>> Of course, if you're in one of these funny 110V countries, that's
>> only 11kW in which case my electric shower will eat most of that.
> Um... yeah... 11kW, not 24kW. I'm in the U.S.
Sridhar> I thought that main breakers in the US split-phase system
Sridhar> were rated for amps across the full 240V of the main feed?
Sort of. Amps per leg, so if you have a 100 amp feed, that means you
have TWO 110 volt legs each rated at 100 amps. You can hang onto that
200 amps worth of 110 volt loads, or 100 amps worth of 220 volt loads,
or some blend of the two (provided the 110 volt loads are well enough
balanced across the two legs that neither hits its individual 100 amp
limit).
Some US homes have only one leg (just 110 volt) but I think that's
only for ancient 30 amp and maybe 60 amp feeds; 100 and 200 are always
"two phase".
So we're pretty close to Gordon.
paul