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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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AOT (Almost On Topic): Electrical Wiring.
Gentlemen. We have now stuffed the bridgeport into the back bedroom
and have closed in the giant gaping 8x8' hole in the wall with spiffy double 36" "french" doors. This is part of a comprehensive remodeling project. We are converting the house, a modest 29'x29' 2 bedroom house to an as yet unspecified commercial purpose. Some time ago I upgraded the old 100 amp electric service to 200 amps. At that time I moved the service entrance from one end of the house to the other. Upon removing the old sheet rock from around the old service entrance I discovered black charring of the insulation face paper by each one of the romex wires that terminated at the old box. In other words, the house was just a kiss away from "up in smoke". At this point, all of the old wiring throughout the house is dead. The new service entrance does not connect to any of it. Instead, I have limited, isolated wiring to two rooms of the house, the front bedroom and kitchen. In each room, a cluster of outlets drops down from a 100 amp branch panel that will hold four 220 amp circuits. These boxes do not have mains. Rather, they are each fed from 100 amp branch breakers in the main 200 amp panel. I have a couple more of these 100 amp boxes. Yesterday I happened to read the installation instructions in one of these as yet unused boxes. To my surprise - and discomfiture - I read words to the effect that "This box is to be used only for branch circuits fed by a box with not more than 100 amp mains. If fed from a branch breaker this should be limited to 70 amps." This is of no immediate concern as these boxes are in temporary service and are not even close to pulling 50 amps never mind 70 or 100. Nevertheless, reading this leads me to the presumption that for code? purposes, branch circuit breakers are not rated as high as main breakers. Does anybody know the reason or logic for this? Gracias. Vernon |
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