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Old 08-24-2018, 05:46 PM   #1
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Old Zinsco Service Panel - No ground?


So I'm installing a mini split ac and while looking at my service panel I noticed no grounding wires on the neutral bar. I also don't notice any copper wire going to the neutral bar. Does this mean my panel has no grounding/neutral bar not bonded?






Also does anyone have any idea how to pop out knockouts from the inside of the panel? I had no luck with a hammer and flathead.

Help is appreciated
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Old 08-24-2018, 06:42 PM   #2
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Re: Old Zinsco Service Panel - No ground?


Google Zinsco recall.
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Old 08-24-2018, 06:48 PM   #3
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Re: Old Zinsco Service Panel - No ground?


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.
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Old 08-24-2018, 07:30 PM   #4
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Re: Old Zinsco Service Panel - No ground?


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Google Zinsco recall.
Yeah I know about the recall. Interesting thing is, it seems my surrounding neighbors haven't replaced their panels yet either. Our homes were built in 1965. Nonetheless, I know it needs to be replaced but right now can't afford it. Replacing the panel is likely a project for next summer.
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Old 08-24-2018, 07:34 PM   #5
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Re: Old Zinsco Service Panel - No ground?


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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.
Not bolted just seems to be a dirty old cap on it. I'm assuming although *usually* you can place neutrals and grounds on the neutral bus in main service panels this is not one of those cases?

If so, looks like my mini split air conditioning won't be grounded for a little while
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Old 08-24-2018, 08:02 PM   #6
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The label should show the location of the bond screw or strap.
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Old 08-24-2018, 08:04 PM   #7
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What is the wiring method used? Metallic cable would not have a grounding conductor from that era.
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Old 08-24-2018, 08:14 PM   #8
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Re: Old Zinsco Service Panel - No ground?


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The label should show the location of the bond screw or strap.
Here is the label
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Old 08-24-2018, 08:17 PM   #9
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Re: Old Zinsco Service Panel - No ground?


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What is the wiring method used? Metallic cable would not have a grounding conductor from that era.
All wiring in the house seems to be mc cable. For the mini split air conditioner I am using UF-B in loctite conduit since it will be outdoors.

The only issue is grounding the condenser.
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Old 08-24-2018, 08:51 PM   #10
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Check for continuity from the neutral to the case.
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Old 08-24-2018, 09:25 PM   #11
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Re: Old Zinsco Service Panel - No ground?


To get the knockouts out.............first turn the power off.
Drill a hole about 25% the size of the knockout centered. Screw in a long screw and/or bend it back with a punch. Wiggle a few times and it will break off.
When done and hands out of panel.......turn power back on.
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Old 08-24-2018, 10:49 PM   #12
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Re: Old Zinsco Service Panel - No ground?


This is not a cap. It is lug, but I can't tell if it actually bolted to the panel.
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Old 08-25-2018, 04:41 AM   #13
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Re: Old Zinsco Service Panel - No ground?


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This is not a cap. It is lug, but I can't tell if it actually bolted to the panel.
Good eyes! I'll check in the morning and send you an update.
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Old 08-25-2018, 04:42 AM   #14
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Re: Old Zinsco Service Panel - No ground?


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Originally Posted by Jim Port View Post
Check for continuity from the neutral to the case.
I'll do that in the morning and send an update!
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Old 08-25-2018, 04:44 AM   #15
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Re: Old Zinsco Service Panel - No ground?


Quote:
Originally Posted by georgemcq View Post
To get the knockouts out.............first turn the power off.
Drill a hole about 25% the size of the knockout centered. Screw in a long screw and/or bend it back with a punch. Wiggle a few times and it will break off.
When done and hands out of panel.......turn power back on.
I tried this earlier but my bit wouldn't bite due to limited space and the angle
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