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Infrared Sensor #115684 12/03/03 08:06 PM
Joined: Oct 2000
Posts: 3,631
Admin Offline OP
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Quote
Recently someone asked if there was anyone that had used this sensor in the field, so I thought I would pass this along.

I was sent to troubleshoot a water heater that was blowing 30 amp fuses in a disconnect. The amp reading on each leg,(after I replaced one blown fuse), was 15.5 on each leg (220 volt 1 phase), so I took out my trusty IR thermometer, model 470, and read 70 deg F on one leg, and 100 deg F on the other, on the line side of the disconnect. When I opened the trough up, I found a loose bug nut.

My question is, is this tap legal(as far as the five foot tap rule is concerned), and if so, do you see any hazards with this setup? (said with a straight face).

-richard

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Re: Infrared Sensor #115685 12/03/03 08:39 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
The problem I see is the disconnect is a tap of a tap.

It looks like a fat 10 awg or skinny 8 awg was already a tap feeding a disconnect so this second tap could overload the first tap.

Is this the service for a building?

How many disconnects are here, more than 6?

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Infrared Sensor #115686 12/03/03 10:26 PM
Joined: Apr 2002
Posts: 7,211
HotLine1 Offline
Member
Are my eyes going, or do I see three (3) "white" conductors at the 2" (guess) nipple going to the "large' disc?? One appears to have a ring of black tape near the bug.

The tap of a tap is a problem, as Bob said, and from the pics, it looks like there are many more issues here.

John


John
Re: Infrared Sensor #115687 12/03/03 11:02 PM
Joined: Jan 2003
Posts: 4,391
I
iwire Offline
Moderator
John I was trying to stay on the disconnect he was asking about.

I did not notice the whites heading up the 2"

I am curious as to what looks like a new 2/0 or 3/0 heading out in a raceway by itself as it was the GEC but it is marked white?

Looks like a rip it all out and start over with a nice new panel type installation. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Infrared Sensor #115688 12/03/03 11:11 PM
Joined: Apr 2003
Posts: 60
C
CaOperator Offline
Member
The copper water pipe sneaking by with valve placed conveniently at disconnect height appears to be the least of the problems. It looks like a buffet of fuses here, and the objects to the left of the screw in type fuse are either dimes, small knockouts or... slugs to solve blown fuse problems? lol.

Good catch, and great use for that meter!

Re: Infrared Sensor #115689 12/04/03 09:05 AM
Joined: Dec 2000
Posts: 4,283
electure Offline
Member
I've never heard of a "5 foot tap rule".
See NEC 240.21(B)(1) for taps 10' or less.

This entire installation is bad, bad, bad.

(If the white taped conductor is indeed a GEC, it should be connected to a grounding bushing where it enters the gutter)

Re: Infrared Sensor #115690 01/07/04 06:13 PM
Joined: Jan 2004
Posts: 91
R
rizer Offline
Member
pure junk get out while you still can. besides the tap looks way to small to be cosidered legal.


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