Megging 480-volt feeder cables

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andy32821

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Location
Orlando, Fl
Occupation
Automation
Hi Everyone,

I'm going to Meg some 480-volt feeder cables for a small commercial facility. I thought I would I would beef up the report by quoting 2005 NETA standard. I was amazed to find the lower limit 100 megohm at 1000 volt.

(This is for existing power cables, not new installations)

I come from an industrial plant where any 480-volt cable above 2 meg was ?good to go?.

I realize that the rest of the world does not operate like a paper mill, but do you guys really recommend a customer pull new cable in a commercial facility or even a public assembly building if a 480-volt feeder cable megs 30 megohm?

Seems like overkill but I wish to conform to the current ?standard of care?.

Plus more work for the electricians.

Does the insurance industry have a post water intrusion lower resistance limit that triggers paying for cable replacement?

Thanks,

Andy
 
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