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Simple CB tester #3938
08/31/01 09:00 PM
08/31/01 09:00 PM
R
Redsy  Offline OP
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Sometimes I am asked if an older or dirty looking residential breaker panel is "safe". I have thought about devising some sort of CB tester to check to see if it will open on overload(not short circuits). I'm thinking various resistors rigged to draw 20, 25, 30 amps,etc. @ 120, 240 volts. You get the idea. Any thoughts, or are these devices commercially available?
I'm not thinking about large scale CB testing, as done with specialized testers.

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Re: Simple CB tester #3939
08/31/01 09:37 PM
08/31/01 09:37 PM
sparky66wv  Offline
Member
Joined: Nov 2000
Posts: 2,236
West Virginia
Redsy,
I don't know if you caught my FPE CB testing experiment, but here it is for a chuckle!

Time-current curves would be a must, a clock, a device protecting upstream, and an amp-meter... plus some resistors.. (Did you check out what I had to use!?)

Definitely not an "exact" science...


[Linked Image]


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
Re: Simple CB tester #3940
08/31/01 09:43 PM
08/31/01 09:43 PM
A
Anonymous
Unregistered

What aspect of the breaker do you wish to test? Whether it trips on short circuit?

Wire known good breaker in series with it and wire that to the ground. You can use an old 60 amp disconnect for this task, preferably one where you can swap breakers to get the size you want. You can use a light gage conductor to reduce the power of the bolted fault.

Dissipating the heat is a problem for any longer term test.

Re: Simple CB tester #3941
09/01/01 01:41 PM
09/01/01 01:41 PM
C
CanadianSparky  Offline
Member
Joined: Mar 2001
Posts: 85
Alberta Canada
I once heard that in order for a circuit breaker to pass its testing it only has to work once and its considered to have done its job. I know in Canada we have a real problem with Federal Pioneer/Stab-Lok, you're lucky to get them to work once.

Re: Simple CB tester #3942
09/01/01 02:35 PM
09/01/01 02:35 PM
G
gpowellpec  Offline
Member
Joined: Dec 2000
Posts: 127
Irving, Tx USA
I would not recommend closing a disconnect on a knowen short circuit. With a setup like this you cant really tell what current actually tripped the breaker and if it was above the AIC. Used 120 volt test sets can be bought for less than $1000 that give actual current reading and have the timers built in. If you shop around you can get really good bargains. There are a lot of companies going in and out otf the breaker testing business. I think GE rents also rent test sets. You can also contact Mark Franks at http://www.atc-trng.com/ or Sales at www.avointl.com.

Re: Simple CB tester #3943
09/01/01 02:36 PM
09/01/01 02:36 PM
B
bordew  Offline
Member
Joined: Aug 2001
Posts: 142
Vienna,Ohio, USA
Quote
Originally posted by CanadianSparky:
I once heard that in order for a circuit breaker to pass its testing it only has to work once and its considered to have done its job. I know in Canada we have a real problem with Federal Pioneer/Stab-Lok, you're lucky to get them to work once.


I have never had any success with FPE, in fact in my the inspectors will not approve any FPE for new construction and will dissuade its continuence and they almost insist on its replacement.
The scary thing is that I just read about it was Air-Force one is protected by FPE. I guess thats why FPE cost 3x more than any other breaker

Re: Simple CB tester #3944
09/01/01 03:31 PM
09/01/01 03:31 PM
R
Redsy  Offline OP
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
I just wanted to simulate overloads(50%?) to see if the breaker will perform.


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