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#45548 - 12/02/04 02:53 AM Test before Livening?
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Now I could be wrong here,
But from what I can gather, testing of Electrical Installations isn't high on the list of priorities, before a given job is livened, in the US.
Sure you might say, an out of town guy having a dig at you fella's.
I would also like to say that, because of where I work (the local PoCo), I'm required to hand in Certificates of Compliance for all of the work that I connect to a supply, every week.
How many of you guys actually get the Megger out or do a Continuity test or even a test on the wire that leads to the Ground Rod?.
Have you ever seen a house or other installation hooked up with the wrong polarity, because someone couldn't be bothered to test the wiring?.
Another question, how many of you guys have a Megger and use it for things other than Fault-finding?.
Over here, I'll sign a Certificate of Compliance only after I see the Electrician perform the tests and write the results on the CoC, I'm not an Inspector, but I have to have a certain paper-trail as well in case there is something that does go wrong.
This is bound to cause some discussion, but please, only useful comments.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin

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#45549 - 12/02/04 04:24 AM Re: Test before Livening?
shortcircuit Offline
Member

Registered: 06/27/04
Posts: 608
Loc: massachusetts
Installations in my area are inspected by the local AHJ before power is hooked up...then we test with the power applied.The POCO tests the SE conductors for polarity before connecting.I don't test with a megger at all on new installations.I'll do a continuity test if I suspect damage by nails or screws to a wire.

Last time I used my megga was for testing the leads going to electric driveway heating mats to make sure they weren't damaged during shiping and to see if they were damaged during installation before power was applied to the mats.

shortcircuit

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#45550 - 12/02/04 05:36 AM Re: Test before Livening?
Bert66 Offline
Member

Registered: 11/01/04
Posts: 78
Loc: Belle Chasse, La. USA
well I'm sure this is not the perfered choice by a long shot, but we run from our temp. service to the primary side of the main breaker. Then test all 120v circuits (lights, recpt., etc.). The only things we don't check this was are the 220v items.

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#45551 - 12/02/04 05:43 AM Re: Test before Livening?
Steve Miller Offline
Member

Registered: 08/30/01
Posts: 322
Loc: Loudoun Cty, VA
Are you sure "livening" is a real word? (just returning the dig). We don't meg the installations but we do the "high tech" test. My Grandfather showed me this back before time began. Ohm out the svc to be sure it's ok. Then put a light bulb in series with the phase right at the breaker. (on the old Edison base fuse panels we'd screw the bulb into the fuse shell) If nothing is hooked to the circuit and the bulb comes on we have a prob. Like I said .. we're not high tech.

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#45552 - 12/02/04 06:06 AM Re: Test before Livening?
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Steve,
 Quote:
Are you sure "livening" is a real word? (just returning the dig).

It is in the NZ Dicshonary!.
I like your style and I must say that we still use the Series test method here, I have a panel made for it in my workshop and I agree, the brighter the bulb the lower the resistance.
Although under current H&S legislation here, the Series test system is banned.
OK then, I'll call it "Prior to Final Connection".
_________________________
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#45553 - 12/02/04 01:14 PM Re: Test before Livening?
pauluk Offline
Member

Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
 Quote:
I like your style and I must say that we still use the Series test method here,

Series bulbs are useful not just for AC mains tests. I've also used a similar arrangement on high-power transmitter HT supplies, and for TV sweep circuits.

Many years ago I also constructed electronic model train speed controls using a pair of 12V headlights bulbs in series with the feed. They served a dual-purpose of protecting the output transistors in the event of a derailment and short, and acting as an overload indicator.

Sorry, that's drifting off topic a little....

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#45554 - 12/02/04 02:41 PM Re: Test before Livening?
richard Offline
Member

Registered: 08/07/03
Posts: 84
Loc: L.I. New York
I have always wondered of a a method a former boss used to troubleshoot dead shorts. He would put a temp socket with a 100 watt a lamp, and connect to a breaker and the circuit with the short. When the bulb went out the short was cleared and he was that much closer to the source of the problem. But is that safe?

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#45555 - 12/02/04 04:02 PM Re: Test before Livening?
Electric Ian Offline
Member

Registered: 02/10/04
Posts: 132
Loc: MA, USA
quote:
---------------------------------------------
It is in the NZ Dicshonary!.
---------------------------------------------

Now come on, Dicshonary is not a word

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