step down transformer
step down transformer
(OP)
I am a journeyman electrician, recently was on a job where a new 13.8kv to 208 volt step dowm tx was being installed I have never seen this big of a stepdown before. Does anyone know what kind of arc flash issuses this might have and wouldn't there be a considerable secondary fault current






RE: step down transformer
Per IEEE 1584, arc-flash calculations are not even required for 208 V systems fed from transformer smaller than 125 kVA.
480 V systems create much bigger arc-flash hazards than 208 V systems.
David Castor
www.cvoes.com
RE: step down transformer
RE: step down transformer
By 'big stepdown' are you referring to the voltage or KVA rating? Its a large KVA rating (and associated low impedance) that will result in high arc flash hazards. The 13.8 kV isn't a big issue by itself unless you've got to work on it. Odds are that every 120/208V system you've encountered comes from the 13.8 kV system through just such a transformer somewhere.