At 04:50 PM 11/15/2004 0500, Mark Andy wrote:
>Anyone know of a chart or whatnot that lists common amperage loads for
>things like:
>
>100W lightbulb
>3/4 hp garage door opener
>small 110V hot tub heater/pump
>
>Etc. etc. etc.?
>Just trying to see if I'm going a little insane on the number of circuits
>on this "rewire the garage" project...
Mark,
Just the easy way, read the lables. Then do a little math:
Power = Voltage * Current
Watts = volts * amps
So for your 100W light bulb assuming it's on a 110 circuit
P = E * I > using some algebra I = P / E or I = 100W / 110V
or approximately 1amp per 100 W bulb.
For HorsePower 1hp = 750W approximately
so 3/4 hp = 3/4 * 750 = 562.5 watts ignoring start up surge current
now converting 562 watts assuming it on a 110V circuit
I = P / E or 562 / 110 or roughly 5 amps
Got no idea on the hot tub unless there's a lable on it stating the watts
it uses.
Again, this ignores start up currents which can go a lot higher. The secret
is to wire the garage so that you don't put a load on every outlet all the
time. For instance you won't run a bench grinder at the same time you're
running the table saw. This is how the wire a house and have 20 circuits.
If you were to turn on everything on a given circuit, you'd trip the circuit
breaker.
Hope this helps
John
John T. Blair WA4OHZ email: jblair1948@cox.net
Va. Beach, Va (eBay id: zebra481)
Phone: (757) 4958229
48 TR1800 48 #4 Midget 65 Morgan 4/4 Series V (B1109)
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