When laying or entering conductors in switchgear via wireways, gutters, "hi-hats" etc., is there a concern of phase placement to avoid the effects of overheating by induced fields?
Why I ask is, I am walking through a job to connect a 2MVA Transformer 480V secondary to a close coupled switchgear main. 6 paralled 750's. Pretty straitforward, about 6FT of cableout of the xfmr, through a custom built wireway, into the switchgear, and terminated.
The Foreman seems to remember a job landing 3kA 480V bus duct (via about 7FT of cables, through a hi-hat, into switchgear; and the cable orientation caused an overheating condition. He doesn't quite remember all the details, or how it was solved, but definately got me thinking.
Are there guidelines for this or a good reference?
Thanks
Why I ask is, I am walking through a job to connect a 2MVA Transformer 480V secondary to a close coupled switchgear main. 6 paralled 750's. Pretty straitforward, about 6FT of cableout of the xfmr, through a custom built wireway, into the switchgear, and terminated.
The Foreman seems to remember a job landing 3kA 480V bus duct (via about 7FT of cables, through a hi-hat, into switchgear; and the cable orientation caused an overheating condition. He doesn't quite remember all the details, or how it was solved, but definately got me thinking.
Are there guidelines for this or a good reference?
Thanks