100 Amp DB

It appears that you are asking about a 100 ampere circuit breaker distribution panel.

If so the main breaker must be rated at 100 amperes, branch breakers installed for various loads will be rated for the wire size serving the branch circuit.

If more sophisticated main overload protection is required such as time delay, and phase imbalance, different class circuit breakers must be selected.

Consult an electrician, or your local electrical supplier or building inspector.

Regards CEKM

That pretty much covers that. I lived on 970 Murry Dr. in Honolulu for three years in the late 70's. How has Honolulu change?

James

James,

I am aboard the UH Research Ship KILO MOANA, don't get to travel much when in port, and don't know much about places on the Island, but am learning.

Additional comments to this thread are also pertinent.

Regards CEKM

I was on a Fast Frigate. FF 1062, the Whipple. Last I heard it was sold to Turkey.

Good luck,

James

dear friends, please post your comment which is relevant to the specific thread coz when we get alert of new post and find some irrelevant, we ended up with frustration, better you can start new thread for all those comment.

thanks

You need to state:

1. Voltage
2. AC or DC
3. If AC, whether single or 3 phase.
4. You will also have to know the short circuit fault current, at the input point of the main switch or main circuit breaker.

You do not want to have this happen

As stated above, you would also need local professional help, which would be familiar with your local electrical system, codes, regulations and general requirements.

Sometimes the easiest thing, is to consult (for free) a local Distribution Board manufacturer,(they will hope you buy a distribution Board made up by them), and also the Power Supply Authority, because they are familiar with your local requirements....

100 A panel board-main I/C breaker is 100 A and bus bar is also 100 A, now you want to select branch circuit breaker (over current protection in general), check the load for each circuit, select cable as par load and fault level, now you can select branch breaker accordingly. remember total branch load should not exceed 100 A. NEC having good explanation in this regard.

thanks

lets have a small example to explain it.

you have a three branch circuit in your DB connected to 2500 W load. supply voltage is 240 V, rated o/p current is 2500/240 i.e. 10.4 A, NEC required 1.25 multiplier (you can use other code as well), this yields a CB requirement of 13 A, use next available size 15 A. Now DB incomer should be 3 x 10.4 x 1.25 = 39 A, use next size 40 A.

Though the above example is very generalised but hope it will help you to calculate for 100 A DB.

thanks