Ground question on existing 240v 100 amp circuit

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  #1  
Old 01-17-14, 05:07 AM
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Ground question on existing 240v 100 amp circuit

Greetings,

I was working in one of my 2 200amp panels to add a circuit and saw something that didn't seem right in the existing wiring. There is a 100 amp 240v circuit for a pool/pool house and it looks as though the ground is wired into the neutral. The wiring for the circuit consist of 4 wires total, 2 hots, a neutral and a uninsulated ground. The ground wire has been divide into two separate strands and inserted into the neutral bus. This doesn't seem right at all but everything else about the wiring seems like it was done by a professional, there is a cutoff box leaving the house, a sub panel on the pool house and another in the pump house. The circuits in the pool house are GFI protected and are not tripping so I don't know if I really have a problem or not. Could the GFI possible not trip if the ground is wired into the neutral in the main box?

Thanks for your input,

Dean
 
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  #2  
Old 01-17-14, 07:53 AM
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Could the GFI possible not trip if the ground is wired into the neutral in the main box?
Assuming you have a typical residential 400 amp service, this is correct.

The ground wire has been divide into two separate strands and inserted into the neutral bus.
The connection by dividing the ground and terminating as two separate strands is not correct, although this wouldn't prevent a GFCI device from tripping either. The ground wire should have been termninated in an accessory lug the most common of which is a forked lug that attaches under two neutral bar screws. Here are several different ones.


https://www.google.com/search?q=neut...w=1024&bih=685
 
  #3  
Old 01-17-14, 07:56 AM
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I agree, the issue is the split conductor.
 
  #4  
Old 01-18-14, 02:55 AM
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This depends , to a large degree , if that 200 amp panel , is it the / a service panel ? Is the main disconnecting means inside that panel or is it some where between it and the meter ?

God bless
Wyr
 
  #5  
Old 01-18-14, 11:56 AM
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Is the meter-socket in a enclosure separate from other service equiptments, or is the meter-socket in an enclosure that contains circuit-breakers?
 
  #6  
Old 01-18-14, 12:14 PM
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The meter socket enclosure is a large box containing two 200 amp breakers and a separate gfi breaker for a hot tub. The two feed lines coming form this panel go into the house to two 200 amp panels. These 2 200 amp panels do not have master circuit breaker. The 100 amp circuit in question goes from one of these 200 amp panels into a 3 pole cutoff outside of the main house. Only two of the poles are being used, the neutral is directly wired. From there it runs underground into another panel on the pool house and get further divided from there. I'm surprised that having the ground and neutral wired to the same bus may be correct after all. I certainly can fix the split ground wire with one of those adapters.
 
  #7  
Old 01-18-14, 01:32 PM
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All Neutral Conductors that connect to a Neutral Conductor that extends from the enclosure that contains a Service Dis-Connect are required to be "Ground-Isolated" . The only point where a Neutral Conductor may be connected to Ground is in the enclosure that contains the Service Dis-Connect (s).
 
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Old 01-18-14, 02:09 PM
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The meter socket enclosure is a large box containing two 200 amp breakers and a separate gfi breaker for a hot tub.
This meter/breaker combo enclosure would be considered your main service. The panels after that would be considered sub panels and normally should have all the neutrals separated from the grounds.

However this will also depend on the original installation and how these 200 amp panels were installed.
What is the wiring method between the outside panel and inside panels? (PVC conduit? Steel Conduit? Romex?)
How many wires are from the outside panel to the inside panel?
 
  #9  
Old 01-18-14, 04:50 PM
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The meter socket enclosure is a large box containing two 200 amp breakers and a separate gfi breaker for a hot tub.
That definitely isn't a straight forward typical 400 amp service.

There is a 100 amp 240v circuit for a pool/pool house and it looks as though the ground is wired into the neutral.
By now you know this is wrong.
 
  #10  
Old 01-19-14, 05:02 AM
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Sounds like the 200 amp panel in question is a sub-panel ? If so , there should be one bar for the neutral ( usually white wires ) and one bar for the earth ground ( usually bare or green or with a green stripe ) wires . There should be no jumper between the two , no jumper between the neutral bar to the metal enclosure / box pf the panel or no green screw bonding the neutral bar to the panel enclosure .

All the neutrals should be made up to the neutral bar and all the earth grounds should be made up to the ground bar .

The feeder from the meter socket / main should have 2 hots , a neutral and an earth ground .

God bless
Wyr
 
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