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Old 08-16-2016, 06:55 PM   #21
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Here's what happened. There is a 1970's era square D 120/208 600 amp distribution panel. It feeds various HVAC units and panels. The facility is a restaurant/event center. I was called in because the 600 amp main in that particular distribution panel had tripped. It was extremely hot and humid that day. The main is fed with 3 parallel 250mcm aluminium conductors per phase. On C phase one conductor was carrying a 113 amp load. After carefully peeling conductors out of the way we were able to take a reading of all 3 parallel conductors for phase C. We were holding steady at 550 amps which is overloaded according to NEC. The entire 1200 amp service is overloaded if you ask me but the owners wouldn't replace it when we rehabed the building.
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Old 08-16-2016, 08:03 PM   #22
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Originally Posted by Big John View Post
Definitely. I'm a big fan of current probes for DMMs.

Saves you money on buying additional meters that just duplicate most of the same functions of your existing gear.

Also the probes often make getting readings much easier in tight quarters than trying to wedge a clamp meter in there.

I don't own any clamp DMMs, but I've got a half-dozen current probes.
I have a couple clamp meters but I used them more like a Wiggy with amp features for basic troubleshooting, if I had something serious going on I'd grab the meters bag with accessories.

I've been known to make snowflakes whine!
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Old 08-16-2016, 09:20 PM   #23
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it might make sense that it tripped because of the heat, but the problem is you don't know that for sure. All you know is that you have a fault condition, and that's why you cannot assume anything, because that's exactly when things can go from bad to worse, in short order.

just sayin . . .
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