Rough Inspection- Panel

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  #1  
Old 11-16-06, 10:52 AM
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Rough Inspection- Panel

I am preparing my detatched garage electrical panel for rough in inspection and wanted a check from the community. Some stats: The house service is 200 A, 2/4 copper in 1 1/2" conduit to garage through exterior wall into panel with metal nut securing conduit to panel and plastic screwed bushing to protect wire when pulling. 100 Amp G.E. Panel at garage.

All 12 gauge wiring will enter the panel from the top through 3/8" cable clamps 2 per. 4 gauge wiring through 1" clamp and 8 gauge wiring through 3/8" clamp.

The ground rod will be installed at the left side bus bar top lug and the ground from the house at the first open screw connection on the same bus bar. The #2 copper neutral from the house will be installed at the right bus bar lug. All branch circuit grounds will be installed on the left bus bar 2 per screw and all branch neutrals will be installed on the right busbar 1 per screw hole. The bottom metal bar bonding the ground bus and neutral bus together will be removed to isolate these systems in the panel.

Do I need the green screw supplied with the panel to ground the ground bus to the panel cabinet? Thanks in advance
 
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Old 11-16-06, 03:41 PM
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If this is a su panel do not use the screw.
 
  #3  
Old 11-17-06, 09:54 AM
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Romex clamps may only be listed for a single cable- you can only put 1 cable through each of the clamps on top unless they're listed for more.

This panel is for a separate structure, and NEC requires a ground rod be driven, as you've stated- bond all the grounds to the ground bar and you're OK. The ground conductor must be unbroken and unspliced between the ground bar and the ground rod. As this is not a service entrance, you should not be bonding the neutral and ground busses; the screw would bond the neutral bus to the box (which is grounded) and should not be used in your case.

You need to check the instructions on your panel and find out if the bus bar lugs are UL listed for 2 connections per- many are only listed for a single connector. If you can't find anywhere that states 2 are allowed, you should only be landing 1 per.
 

Last edited by grover; 11-17-06 at 07:41 PM.
  #4  
Old 11-17-06, 05:00 PM
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Green bonding screw.

bottom metal bar bonding the ground bus and neutral bus together will be removed to isolate these systems in the panel.*

Thats good.


??Do I need the green screw supplied with the panel to ground the ground bus to the panel cabinet? *

If these terminals are Isolated from the panel,IE; black palastic.

Then yes, you need that "Green bond screw", Thru the GROUND BUS ONLY!!!

Easy way, Check continuity from neutral to the can (un-painted part). If none, thats good.

Do the same for the ground buss,(Then check between the two.) If none ,ADD the screw.

I beleive the latter to be true.
 
  #5  
Old 11-17-06, 06:12 PM
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Good info all around. These terminals are islated from the box and the screw will be needed on Ground bus. What height above the floor is the panel supposed to be maounted in a detached garage?
 
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Old 11-17-06, 06:24 PM
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Top 6' ,
Actualy, I believe the top of the disconnect (main) switch cannot be above 6'7"...
3' clearance in front.
not located in a closet, unless dedicated for this use.
 
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Old 11-17-06, 07:39 PM
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Most typical two-screw metal NM connectors are rated for two cables. Some even three.

The height rule is no higher than 6'7" to the center of the highest breaker handle. The enclosure doesn't matter.
 
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Old 11-18-06, 03:23 AM
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Is there any limitation on how low?.
 
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Old 11-18-06, 05:07 AM
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No, there is not.
 
  #10  
Old 11-20-06, 09:07 PM
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Rouh-in permit recieved. Thanks for the input. Off to get some wire nuts and outlets...
 
  #11  
Old 11-21-06, 05:04 PM
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Wink

Congrats! Stay on your toes.
 
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