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boy, watch out with some of these answers. wire sizes for 100 amp and 200 amp service is as follows:

100 amp: copper #4 AWG for hot conductors and neutral, aluminum #2 AWG for hot conductors and neutral

200 amp: copper #2/0 AWG for hot conductors and #1AWG for neutral, aluminum #4/0 AWG for hot conductors and #2/0 AWG for neutral.

these are only valid for up to 100 feet of conductor, for more than 100 feet increase wire size by one size each hundred feet

btw, 14 gauge wire is for 15 amps, 12 gauge wire is for 20 amps

this info is off of a handout from my local building department, you might want to check with your local building inspector to see if they want something different

2006-12-25 14:49:43 · answer #1 · answered by ErasmusBDragen 4 · 1 0

For residential construction the correct size for 200 A is 2/0 copper. If using aluminum the correct size for residential construction is 4/0!

For 100 A residential construction the correct size copper is #4 and the correct residential construction size for aluminum is #2.

Note that if this is not a dwelling, not single phase, not 120/240 V 3 wire service then you must use larger sizes... namely 3/0 copper or 250 kcmil aluminum for 200A

For 100 A and not meeting the above requirements you must use #3 copper or #1 aluminum.

To be able to derate the neutral conductor and use a smaller size other provisions must be met and a load calculation must be done. Most times this i'snt really worth the effort and I'd go ahead and use the same size conductors. However this is only a suggestion and the way I would do it. If you want to derate the neutral size you should have a load calculation done.

As far as increasing the size per 100' that may be a good rule of thumb but a true voltage drop calculation must be done to determine if this is needed.

2006-12-25 15:13:15 · answer #2 · answered by David B 4 · 3 0

A convenient rule of thumb is that the cross sectional area (and current capacity) of a wire is doubled for a step of three in the American Wire Gauge (AWG). Using 12 AWG copper wire as a starting point, which has an ampacity (ampere capacity) of 20 amps, 9 AWG copper wire has an ampacity of 40 amps, 6 AWG copper wire has an ampacity of 80 amps, 3 AWG copper wire has an ampacity of 160 amps, and so forth. Odd gauge wire sizes are not normally available, like 9 AWG and 3 AWG in my example, and you'd have to use the next larger even wire size.

100 amps, being slightly more than 80 amps, could have used a 5 AWG wire, but the next available size is 4 AWG. Likewise,a 200 amp circuit requires a 2 AWG wire.

However, the final authority is the National Electrical Code. I give this rule of thumb only for preliminary wire sizing until the Code can be consulted.

2006-12-25 23:31:11 · answer #3 · answered by Tech Dude 5 · 1 1

what are u using that requires 100 and 200amp shut off switches?
Most elec heater and water heater, a stoves use only 60 amp breakers?
Are you talking about service to the house main breaker or a sub-breaker?
please add for better question or better answers?

2006-12-25 15:14:49 · answer #4 · answered by john t 4 · 2 0

Depends on what it is going to? 10 ga is a heavier duty, could get by with 12 ga

2006-12-25 14:24:04 · answer #5 · answered by Gary S 5 · 0 5

14ga wire for 100amp 12ga for the other

2006-12-25 14:37:19 · answer #6 · answered by james a 1 · 0 4

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