Isolating Nuetral & ground in a sub panel

Originally Posted By: dmacy
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http://www.nachi.org/bbsystem/usrimages/5/52105_Bedford_002_Small.jpg ]


2) Automatic garage door isnt supposed to be on a GFCI. Is this correct? The one I operated lately kept tripping the GFCI.


3) Just would like some insight pertaining to the FPE panels pictured below.

This is the sub panel in the garage and observed numerous problems but would like to have your opinion.

[ Image: http://www.nachi.org/bbsystem/usrimages/5/52205_Rocky_River_004_Small.jpg ]

This is the main panel in the basement.
[ Image: http://www.nachi.org/bbsystem/usrimages/5/52205_Rocky_River_009_Small1.jpg ]


Thanks

Dave


Originally Posted By: jkline
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Try this thread for the “neutrals and grounds in subpanels” question. Good explanations by Bob Badger and Greg Fretwell.


http://www.nachi.org/bbsystem/viewtopic.php?t=10093&highlight=neutrals+grounds

Here's an NEC reference for that issue from Code Check:
NEC 250-24A5 "Load-side Grounding Connections. A grounding connection shall not be made to any grounded conductor on the load side of the service disconnecting means except as otherwise permitted in this article."


Originally Posted By: jpope
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dmacy wrote:
I would like someone to explain why the nuetral & ground need to be isolated in a sub panel.


To reduce the potential for a parallel or alternate neutral path back to the service equipment. Metal conduits, fences and other potential paths could become energized.

dmacy wrote:
1) What is the code for underground burial. Please specify wire type and depth of burial.


It's difficult to determine the type of cable you have pictured. If is UF it needs to be buried 24 inches and protected where it exits the earth.

dmacy wrote:
2) Automatic garage door isnt supposed to be on a GFCI. Is this correct? The one I operated lately kept tripping the GFCI.


Yes it can be, but it is not required to be (assuming it's a ceiling mounted receptacle).

dmacy wrote:
3) Just would like some insight pertaining to the FPE panels pictured below.


Serious problems including direct taps (no overcurrent protection) and apparent over fusing (breaker too large for wire size).

Recommend replacement based on brand and defects. . .


--
Jeff Pope
JPI Home Inspection Service
"At JPI, we'll help you look better"
(661) 212-0738

Originally Posted By: fbartlo
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I actually have a sub-panel in my own house that has only one isolated bus bar. No ground bus bar. I currently have a stove and a dryer that each have 3-wire circuits hooked up to it, so I’m not bothered about it.


This subpanel is a Siemens subpanel that is only a few years old. It does say "not suitable for service use in Canada." How would one wire a system with both neutral and ground wires to such a panel, or is it simply not suitable?

The best approach I could think of would be installing another bus bar that is bonded.


Originally Posted By: James D Mosier
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The best approach that you could think of is the correct approach.



Jim Mosier