relief
Active member
what if his main is only 100 amp or 125?
90 percent of all US dwellings have 200 amp service, some have more some have less, so the assumption will most likely proove to be right. If the original poster could not grasp this simple concept, then by all means he should not be wiring a sub panel himself.
The service panel/meter box or both by NEC code must have a disconnect rated for the service of the dwelling (not rated lower either). 200 amp will have a 200 amp disconnect and so on, so he must disconnect the service power before installing the sub panel.... if he does not know the difference between a 200 amp, 100 amp service and so on then original poster does not have the grasp of the subject at hand to due the job himself.
Common sense tells someone take away 40 amps from what ever the service rating (x) gives you amps left over.
x - 40 = y
Besides, he's already pulling AT LEAST 30 amps with the 15 amp run and the extension cords. Im sure 40 amps will not effect his current amperage usage. Common sense.