One event, more than one fault

[mdshunk]

Somebody needs to invent something you can stick in your shirt pocket that turns your whole body into a volt tic. Sorta along the lines of a personal gas monitor, but to keep you from touching something live.

 

[480sparky]

You been reading that 1942 Handbook again, Chris? :grin:

BTW, was that fed with 483-phase?

 

[mivey]

My guess is that the fault is resistive enough to probably be below the value of the OCPD.

That would be my guess.

Glad you are okay Chris.

 

[stickboy1375]

Somebody needs to invent something you can stick in your shirt pocket that turns your whole body into a volt tic. Sorta along the lines of a personal gas monitor, but to keep you from touching something live.

http://stormkingmtn.com/index.cfm?Section=43&PageNum=194

 

[mdshunk]

http://stormkingmtn.com/index.cfm?Section=43&PageNum=194

That one is along the lines of what I was thinking, but the one you linked to starts sounding at 3 feet away. Probably not all that useful to the electrician. At 350 dollars, the price is about what I thought something like this should cost.

 

[stickboy1375]

That one is along the lines of what I was thinking, but the one you linked to starts sounding at 3 feet away. Probably not all that useful to the electrician.

The thing would be going off non stop... :grin: Still thought it was pretty neat.

 

[chris kennedy]

Maybe the resistance of the heat strips kept the breaker from tripping. You would still have voltage, but not enough current to open the breaker.

If the current went through the heat strip then to the metal case of the AHU, the AHU's EGC would act like a grounded conductor and I would have seen no voltage to the recepticals grounded conductor.

My guess is that the fault is resistive enough to probably be below the value of the OCPD.

This sounds like a good guess.