On Sunday, June 26, 2016 at 4:34:01 PM UTC-4, Ralph Mowery wrote:
So that would be the maximum time spent above the 200 amp line. But I stil
l would like a better answer as to how far past I can go before I start tri
pping the main. In earlier posts I read that only after a sustained amp d
raw of 3 hours would it trip. If this is true then I shouldnt be anywhere
close to having a problem if I am only
r more? I understand what I am asking is pushing the rules, but would like
a reasonable idea of how far past I can go. I want to purchase one more be
d and if that puts me at 210-220 amps for 20 mins at a time, just want to k
now that I can do that without tripping my main etc.
+1 to all that.
The OP is right at 200A with the existing 5 beds. The dryer makes it 216A.
Five beds, 200A, the beds are 40A each, so how can they add a couple of
new beds? Even one puts it at 240A/256A. And in line with what you're
saying about warming up, once tripped, if it's reset, it's going to trip
faster the next time. Doesn't sound good with a business with 6 customers.
Side note, I'm having a hard time figuring out where all this power is
going. That's 10KW for one bed. I've never been in one, but I thought
they put out UV, not a lot of heat. 10KW sounds like enough power to
start cooking you, similar power to a home oven.
They are cooking you. If the beds are commercial units they can use
from 10 to about 20 KW. The time is about 5 to 15 minutes depending on
how much you want to tan.
I have not been in one either, just going by the specifications of them.
It does not mater if it is UV light or just heating units all of the
power will be converted to heat. Not sure how much the person will
carry out with them.
If the beds are that big he probably also needs to up the air
conditioner by about another ton.
On Sunday, June 26, 2016 at 2:23:10 PM UTC-4, Tony944 wrote:
Wire properly sized presents no risk, so IDK what the alleged problem
with wire heating is when the draw is within the 200A rating, there is
considerable margin. And
resistance is resistance, so a bad connection with resistance X is
going to create the same heat with 196A flowing through it on a 400A
service as it will on a 200A.
On Thursday, October 22, 2009 at 9:02:51 AM UTC-7, JayB wrote:
If you apply 240-Volt to the load and have 200 Amps current, you've got 48 KVA. If you apply 120-volt and have a 200 amps, you've got 24 KVA. If you connect 200 Amps load to each of 120-volt leg, you've got 48 KVA total.
That is just a guideline for some individual loads and a rule for
others. When you do the load calc for the whole service, you can
install based on 100% of the result if you are being cheap. The NEC is
not a design manual, it is just a minimum standard.
On Mon, 31 Oct 2016 20:00:11 -0400, firstname.lastname@example.org wrote:
And oftentimes the pole transformer is not capable of 48KVA.
Most of them have their KVA rating painted right on the exterior of
(You may need binoculars to read it from the ground).
And dont forget that they often supply power to other homes and/or
buildings as well.
On Wed, 02 Nov 2016 16:05:10 -0500, email@example.com wrote:
Transformers supplying multiple homes MAY not be capable of supplying
the full load of all the houses at once. Any single residence
transformer WILL be sized to handle the full load - at least in
I was unable to install a 200 amp sewrvice in my home because the
transformer feed/undeground cable was lot large enough. I was limitted
to 125 amps.
On Wed, 02 Nov 2016 19:06:38 -0400, firstname.lastname@example.org wrote:
That is certainly not true in the US. They will feed 3 houses from a
50 KVA unit and assume it will handle spikes above the 50 KVA. My
house os one of 3 on a 37 KVA unit. The guys told me, they will
replace it with a 50 when we burn it up.
These houses have 200a panels but they are fed with 2ga 1350 alloy
aluminum overhead service conductors. Voltage drop has not been a
problem here for me. I still get 124 or so
On Monday, October 31, 2016 at 8:00:09 PM UTC-4, email@example.com wrote:
In reality there is never more than 200 amps of current flowing
in a 200A service. If it's a balanced load, the same 200A is flowing
through half the 120V loads, then on through the other half of the
120V loads. There is never more than 200A flowing in the service
conductors. You can support 400A worth of 120V loads, but it's
just 200A being counted twice.
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