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Old 07-15-2016, 08:11 AM   #1
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Default From a Set of Specifications.

This blurb is from a set of specifications for a new job we are bidding to an EC. I just hope this is a typo or oversight by the engineer.

Quote:
Insulation resistance of conductors rated at 600
volts shall be not less than the following for listed wire sizes, when tested at 1000 VDC:


1. #6, 4, and 2 100,000 ohms OR.1 MEGAOGMS
2. #1, 1/0, 2/0, 3/0, and 4/0 50,000 ohms OR .05 MEGAOHMS
3. All sizes larger than 4/0 25,000 ohms OR .025 MEGAOHMS
at 480 VAC the above would be a fault

100 Megohms should be the minimum regardless of conductor size AND new conductors should be full scale 2,000 -11,000 megohms.
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Old 07-15-2016, 08:14 AM   #2
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Is Brain John a bad electrician ?

Oops, just read your other post...
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Old 07-15-2016, 11:20 AM   #3
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Quote:
Originally Posted by Brain John View Post
This blurb is from a set of specifications for a new job we are bidding to an EC. I just hope this is a typo or oversight by the engineer.



at 480 VAC the above would be a fault

100 Megohms should be the minimum regardless of conductor size AND new conductors should be full scale 2,000 -11,000 megohms.
Do they normally give a chart based on wire size?
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Old 07-15-2016, 11:47 AM   #4
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Are you saying that some engineer screwed up here Brian? How unique. Usually I just go read '''Forensic Case Files'' at ECM when I need my fix.
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Old 07-15-2016, 01:19 PM   #5
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Do they normally give a chart based on wire size?
No, normally it says insulation resistance test all feeders #6 and larger minimum readings to comply with NETA
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Old 07-15-2016, 01:50 PM   #6
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Quote:
Originally Posted by Brain John View Post
This blurb is from a set of specifications for a new job we are bidding to an EC. I just hope this is a typo or oversight by the engineer.



at 480 VAC the above would be a fault

100 Megohms should be the minimum regardless of conductor size AND new conductors should be full scale 2,000 -11,000 megohms.
You gotta love low standards! Now this is something I can comply with!!

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Old 07-15-2016, 03:04 PM   #7
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Quote:
Originally Posted by Brain John View Post
No, normally it says insulation resistance test all feeders #6 and larger minimum readings to comply with NETA
That sounds more like what I was thinking.
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Old 07-15-2016, 07:03 PM   #8
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You got a brother named Brian who used to visit this site, Brain?
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Old 07-15-2016, 07:09 PM   #9
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You got a brother named Brian who used to visit this site, Brain?
Brian is lesdysic, just say'n.

This is a common tic with outstanding pipe running electricians.
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Old 07-15-2016, 07:13 PM   #10
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Yeah, I just noticed his other post too. I had the same problem Brian. Cricket will correct it sooner or later...
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Old 07-15-2016, 09:52 PM   #11
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soon as that genie comes out of the bottle! just kiddin cricket
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i like neat! just doesnt always happen
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Old 07-16-2016, 07:38 AM   #12
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that's some funny stuff Brain. I wonder what other kinds of idiocy are hidden in those specs.
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Old 07-16-2016, 08:43 AM   #13
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Quote:
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that's some funny stuff Brain. I wonder what other kinds of idiocy are hidden in those specs.
Good question. Maybe the guy that put them together wasn't truthful on his employment application and over stated his education and past experience.
"I'm an engineer" is a popular claim that I've read a lot lately...lol
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