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 Post subject: Available fault current required, on a 277V system
PostPosted: Sun Apr 17, 2022 8:35 pm 

Joined: Sun Apr 17, 2022 8:33 pm
Posts: 1
Hello everyone

I'm wondering if there's any data available that indicates the necessary available fault current, on a 277V system, to blow a hole through the sheathing of a MC cable.


Assume worst-case - a bolted fault either between phase/ground or phase/sheathing.


If I know that necessary available fault current, I could then conduct a fault current analysis for my particular situation to determine if there's even sufficient current for that to hypothetically occur.


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 Post subject: Re: Available fault current required, on a 277V system
PostPosted: Tue Apr 19, 2022 10:25 am 
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Joined: Wed May 07, 2008 5:00 pm
Posts: 868
Location: Rutland, VT
you may want to contact the manufacturer to see if they have any data.

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Barry Donovan, P.E.
www.workplacesafetysolutions.com


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 Post subject: Re: Available fault current required, on a 277V system
PostPosted: Wed Apr 20, 2022 12:44 pm 

Joined: Wed Feb 02, 2022 5:33 pm
Posts: 5
Location: Oregon
Agreed with Barry here, I'd start by asking the manufacturer to see if they have any information floating around on that sort of thing.

If you get nothing else, you could try to work off of the damage curve or some sort of equivalent fusing curve for the sheathing you have. Damage to the sheath (and cable for that matter) is based on both fault current and time . . . so there may not be a super simple answer.

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Michael Antonishen, P.E.
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