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Old 06-03-2013, 05:22 PM   #1
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Equipment Bonding Jumper


Hi all,

I recently took ownership of a condominium. Prior to the purchase, I had an inspection done, and in the inspection report, it stated:

Quote:
The electric panel is missing an equipment bonding jumper between feeder conduit bushing and panel box
You can find pictures of the panel box with the cover removed here (apologies for the somewhat poor quality): http://sdrv.ms/17TxpTr. Could anybody help me better understand what the issue is here?

On a slightly different note, I have since uninstalled a lamp fixture in one of the bathrooms. With all the circuit breakers turned off, my volt meter is still showing a reading on the orange wired (picture of wiring also included at above link). Any chance that these two issues are related?

Appreciate any insights you could share !

Thanks,

-skyfx

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Last edited by skyfx; 06-03-2013 at 07:45 PM.
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Old 06-03-2013, 05:47 PM   #2
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Equipment Bonding Jumper


From what I can see your condo must be wired through emt and a bonding bushing would not be required if the emt isi installed properly. The issues are unrelated. What type of volt meter are you using and what is the voltage?

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Old 06-03-2013, 05:55 PM   #3
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Equipment Bonding Jumper


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Originally Posted by brric View Post
From what I can see your condo must be wired through emt and a bonding bushing would not be required if the emt isi installed properly. The issues are unrelated. What type of volt meter are you using and what is the voltage?
Hah, interesting. Thanks for the info. What's the tell on a proper tubing installation?

W.r.t. the volt meter - it is a cheap-o Commercial Electric one I picked up at Home Depot. It has three levels: extra low sensitivity ("O"), low sensitivity ("L"), and high sensitivity ("H"). With all the circuit breakers off, having the meter on "L" and "H" causes it to go off when held against the orange wire in the picture. Specifically, the "70-250V" light illuminates and it buzzes. In contrast, when you put it into a socket on "O", the "CAT II" on the meter lights up. To be honest, I don't understand why the two scenarios produce different results, but perhaps you do?

Thanks again

Last edited by skyfx; 06-03-2013 at 07:46 PM.
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Old 06-03-2013, 06:00 PM   #4
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Equipment Bonding Jumper


Is this a service?

2011 NEC requires the use of bonding jumpers at the service around impaired connections, such as eccentric knockouts, concentric knockouts, etc.

Installing a bonding bushing with a correctly sized bonding jumper would be necessary.



Here's a pic of installed bonding bushings-

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Old 06-03-2013, 06:01 PM   #5
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Equipment Bonding Jumper


This has to be a feeder from the service disconnect most likely located at the meter bank
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Old 06-03-2013, 06:07 PM   #6
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That's what I was leaning towards also- there's no main bonding jumper in the panel.
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Old 06-03-2013, 06:15 PM   #7
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Equipment Bonding Jumper


Quote:
Originally Posted by mm11 View Post
Is this a service?

2011 NEC requires the use of bonding jumpers at the service around impaired connections, such as eccentric knockouts, concentric knockouts, etc.

Installing a bonding bushing with a correctly sized bonding jumper would be necessary.



Here's a pic of installed bonding bushings-

Thanks for sharing those pictures. Juxtaposing the diagram you posted with a picture of my panel, doesn't the wire covered with white electrical tape in the top right of my panel correspond with the equipment bonding jumper in your diagram?
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Old 06-03-2013, 06:20 PM   #8
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Equipment Bonding Jumper


Quote:
Originally Posted by Techy View Post
This has to be a feeder from the service disconnect most likely located at the meter bank
Just to clarify, you are suggesting that the wiring in the bathroom is serviced by a different panel from my own? Is that common in condo buildings?
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Old 06-03-2013, 06:34 PM   #9
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No, that's the grounded (neutral) conductor.
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Old 06-03-2013, 06:43 PM   #10
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Quote:
Originally Posted by mm11 View Post
No, that's the grounded (neutral) conductor.
White = neutral, duh. Got it.

Okay, so:
  • What's the function of the missing equipment bonding jumper?
  • Is it a more recent electrical requirement (hence the NEC 2011 reference)?
  • And how involved would such an installation be? Would the electrician need access to the main electrical room of the building to disconnect power to the entire unit?

Last edited by skyfx; 06-03-2013 at 06:54 PM.
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Old 06-03-2013, 06:57 PM   #11
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Equipment Bonding Jumper


Quote:
Originally Posted by skyfx View Post
White = neutral, duh. Got it.

Okay, so:
  • What's the function of the missing equipment bonding jumper?
  • Is it a more recent electrical requirement (hence the NEC 2011 reference)?
  • And how involved would such an installation be? Would the electrician need access to the main electrical room of the building to disconnect power to the entire unit?
It is not missing.
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Old 06-03-2013, 06:59 PM   #12
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Originally Posted by brric View Post
It is not missing.
Now I'm confused . What about the diagram that mm11 posted?
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Old 06-03-2013, 07:25 PM   #13
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The pic I posted would apply if your panel was the service point.
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Old 06-03-2013, 07:29 PM   #14
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Originally Posted by mm11 View Post
The pic I posted would apply if your panel was the service point.
Could you define service point? The meters are in a room separate from the condominiums, if that is what you are referring to.
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Old 06-03-2013, 07:36 PM   #15
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Equipment Bonding Jumper


It looks like the EMT serves at the equipment grounding conductor. Maybe your HI was concerned about continuity because knockouts were used.

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