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Old 08-25-2018, 06:12 PM   #16
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Re: Old Zinsco Service Panel - No ground?


Quote:
Originally Posted by Jim Port View Post
Check for continuity from the neutral to the case.
Quick question, I didn't have a chance to check yet as I'll have to go pick up a multimeter. My current tester doesn't have a continuity option.

If continuity exists between the neutral bar and the case, does this mean that I can connect my ground wire from UF-B to the neutral bar?

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Old 08-25-2018, 06:32 PM   #17
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Re: Old Zinsco Service Panel - No ground?


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Originally Posted by joed View Post
I don't see any ground wires in that panel anywhere. I do see a white cable that appears to be bolted to the chassis under the two red wires.
Yes, I am seeing the same situation. The # 6 copper white conductor (?) (yellow dash lines) is mechanical lugged down to the back of the breaker box cabinet right under the two red wires. (small yellow circle) Then, it short jumpers over and enters a bonding lug on a metallic grounding bushing (larger yellow circle) on what appears to be maybe a 3/4" metal conduit fitting ??
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Old 08-25-2018, 08:33 PM   #18
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Re: Old Zinsco Service Panel - No ground?


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Originally Posted by Gregsoldtruck79 View Post
Yes, I am seeing the same situation. The # 6 copper white conductor (?) (yellow dash lines) is mechanical lugged down to the back of the breaker box cabinet right under the two red wires. (small yellow circle) Then, it short jumpers over and enters a bonding lug on a metallic grounding bushing (larger yellow circle) on what appears to be maybe a 3/4" metal conduit fitting ??
I'm going to go take a look at the panel again in about an hour. Assuming that you're correct, does this indicate the metal casing of the panel is grounded? If so does that make the neutral bar grounded? Nonetheless I'll run a continuity test.
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Old 08-25-2018, 09:40 PM   #19
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Re: Old Zinsco Service Panel - No ground?


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Originally Posted by 818han View Post
I'm going to go take a look at the panel again in about an hour. Assuming that you're correct, does this indicate the metal casing of the panel is grounded? If so does that make the neutral bar grounded? Nonetheless I'll run a continuity test.
Not necessarily. But if I am right, someone was assuming by installing a white conductor with a lug to the breaker box sheet metal back, and then ran it to the conduit fitting's grounding bushing lug...they were "bonding" the two and grounding them. This action does not assure the breaker box is grounded though, it just implies so... until it is proven to be or not.
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Old 08-26-2018, 06:29 PM   #20
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Re: Old Zinsco Service Panel - No ground?


Quote:
Originally Posted by Gregsoldtruck79 View Post
Not necessarily. But if I am right, someone was assuming by installing a white conductor with a lug to the breaker box sheet metal back, and then ran it to the conduit fitting's grounding bushing lug...they were "bonding" the two and grounding them. This action does not assure the breaker box is grounded though, it just implies so... until it is proven to be or not.
So what is interesting is I tested positive for continuity between the white conductor/grounding bushing lug and the neutral bar. I assume this means the neutral bar is indeed grounded?
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Old 08-26-2018, 07:00 PM   #21
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The incoming white connects to the neutral bar for the branch circuits. It does not mean you panel is bonded. You need to go between the case and the neutral bar.
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Old 08-26-2018, 08:33 PM   #22
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Re: Old Zinsco Service Panel - No ground?


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Originally Posted by Jim Port View Post
The incoming white connects to the neutral bar for the branch circuits. It does not mean you panel is bonded. You need to go between the case and the neutral bar.
Hmm not getting continuity when testing between the case and the neutral bar. I am getting it when testing between the neutral bar and the grounding bushing (large circle) that Greg identified. The wire from the grounding bushing is bolted to the panel (smaller circle)

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Old 08-26-2018, 09:07 PM   #23
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Re: Old Zinsco Service Panel - No ground?


UPDATE: I went ahead and cleaned up the debris and paint from the case with a flat head in multiple spots. After doing so, I tested continuity between the neutral bus and the case in those spots.

All tested positive for continuity.
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