Isolator Ratings
Isolator Ratings
(OP)
We are getting some electrical cabinets delivered from America. They are supplying 4 cabinets with 1600A CB's, how do I work out what size CB I need to feed them from our supply tx. What calculation formula do you use, as we do have more coming in of different sizes.
Cheers,
Keithc
Cheers,
Keithc






RE: Isolator Ratings
1. Supposing that you have more diversified sizes and variety of electrical equipment, then it may pay off to model and determine circuit breaker sizes via the following or similar software:
E.g. SKM, Inc. (DAPPER, A-FAULT, etc.), OTI, Inc. (ETAP), EDSA, etc.
These businesses have their web sites.
http://www.skm.com
http://www.etap.com
http://www.edsa.com
2. Less accurate approach is usually by hand with some estimations and approximations. Suggested reference:
Beeman D., "Industrial Power Systems Handbook," McGraw-Hill Book Co., Inc., 1st Edition, 1955
3. To provide more info, additional information is needed:
1. Load diversity
2. Motor load
3. Power factor compensation
4. Harmonics
5. Transformer nameplate data
etc.