Applying NFPA 70E 130.3 Excpt No. 1
Applying NFPA 70E 130.3 Excpt No. 1
(OP)
NFPA 70E 130.3 exception no. 1 allows not performing an arc flash analysis on circuits <240 where fed by a single transformer rated <125 kVA.
Is there a method to visually determine the size of a single pole mounted transformer - from the ground?
What size transformers are typically used by the serving utilities when the electric service size is 120/240V 200A, or 120/240V 400A?
Is there a method to visually determine the size of a single pole mounted transformer - from the ground?
What size transformers are typically used by the serving utilities when the electric service size is 120/240V 200A, or 120/240V 400A?






RE: Applying NFPA 70E 130.3 Excpt No. 1
Could be anywhere from 5 kVA 1Ø to 500 kVA 3Ø, depending on how many customers are served from the transformer.
RE: Applying NFPA 70E 130.3 Excpt No. 1
RE: Applying NFPA 70E 130.3 Excpt No. 1
Not doing the study and using the tables, in most cases, will result in your people wearing more PPE than they would if an actual analysis was done. That means more PPE expense, upkeep, and difficutly working while wearing it.