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Plug works with Siemens breaker but not Stab-Lok?

L

Long Con

New member
Hi, I am installing a plug for a Dyna-Glo Workhorse electric garage heater, it needs a Nema 6-30 plug, and a 30 amp double pole circuit breaker.

I got it all hooked up and was dismayed to see that, even though I could read 120 volts off each pole, it was not powering the unit.

When I tried it on a different breaker panel, with Siemens breakers, it worked fine.

I thought my Stab-Lok breaker was faulty so I bought a new one, with the same negative result.

I'm just looking for some insight, I'm not sure how to troubleshoot this.
 
Is the power on both bus bars in the panel?
120 each line to common. 240 across both bars?
It is a two bar panel, correct?
Then check load side of breaker. 120 each line, 240 across the two.
Then check line side of plug.
Then load side of plug.
Are you sure you have l1 and l2 connected proudly at the line side of plug?
 
as waybob said you need to measure L1 to L2 forget the nuetral for the time beeing.
mesure your mains L1 to L2 to make sure its wired split phase.
measure L1 to L2 at the breaker
measure L1 to L2 at the heater
see were this gets you.

tom
 
What about each line to the neutral/common? Is this a sub panel,?
Check load side of the main panel feed breaker. See what sort of breaker feeds this sub panel. Check the load side of that breaker.
 
There is no neutral/common, just two hots and a ground. 120 from each hot to the ground.

It's a subpanel in the garage, and the breaker that feeds the panel has two hots and a neutral and ground, and both hots read 120 to ground and 240 across.
 
At the main panel load side of the breaker feeding the garage subpage, you read 240 across the legs.
But at the garage sub panel bus bar connections, you only read two 120 legs to ground, with no reading across the two legs?
Is there some other panel between the two panels?
Is there a box between the two with connections made in that box? Maybe lost a leg in wiring at one point and somebody wired it so only one leg fed both bars?
Not making sense to me.
 
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No, I'm reading 240 across at the mains on the subpanel in the garage. Just reading zero across the two poles of the breaker for the heater plug.
 
This should be obivous but are there stabs on the main buss bars?
I found a panel with none on there the panel mfg. used a 30 braker interoir on 24 breaker panel just left the stabs off 6 spaces so you could only put 24 in the pannel, the door even had 30 knockouts for breakers and the client put breaker in bottom of the panel hooked to one stab and nothing to there to connect 2nd breaker pole to. had same issue your having.

tom
 
it sounds like Stab-Lok breakers are not compatible with a Siemens panel. not every breaker works with every panel . . .
it may go in the hole, but it's not contacting the buss bars - installed, and presuming the toggle is in the ON position.... if there is no voltage on the breaker terminals, it is not making contact with the buss bar.
 
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