Would anyone know how much clearance we need to leave between or steel feed
main and an exposed crane rail with 440 volts?
George Church
Rowe Sprinkler
___
Sprinklerforum mailing list
Sprinklerforum@firesprinkler.org
Hello George,
Just a quick look at the 05 NEC 610.57 talks about crane/hoist
controls and requires 2 1/2 feet in front of cabinets.
Now NEC 110.26 (a) (1) Working Spaces Condition 2 Exposed
conductors 151-600 volts to ground requires 3 1/2 feet.
I always ask The question - How close to that
George
You won't go far wrong if you follow the table ( 1.9 I think in NFPA
15). This requires a minimum of 7 inches (178mm) for all voltages
13.8 kV
Stewart Kidd
Would anyone know how much clearance we need to leave between or steel feed
main and an exposed crane rail with 440 volts?
Sent: Monday, February 18, 2008 10:43 AM
To: George Church
Subject: Re: Clearance from 440v
Hello George,
Just a quick look at the 05 NEC 610.57 talks about crane/hoist
controls and requires 2 1/2 feet in front of cabinets.
Now NEC 110.26 (a) (1) Working Spaces Condition 2 Exposed
conductors 151
