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Old 11-02-2012, 05:35 PM   #1
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bonding screw


Will i need to install a bonding screw I didnt see one .Also has alluminum rod at top going out to the copper pipe from neutral bar.bonding screw-imag0116.jpg
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Old 11-02-2012, 09:22 PM   #2
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Is the aluminum bar clamped to the panel at the hole where it passes through on its way to the water pipe?

Can you tell whether there is metal to metal contact between the neutral bus bars (terminal strips) and the back of the panel? (not easily seen in the pictures)

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Old 11-02-2012, 10:07 PM   #3
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The panel label will show the location where the bond screw should be installed.
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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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Old 11-02-2012, 11:13 PM   #4
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I looked and there is no lable showing its location.
The alluminum just goes up through box to pipe at water heater -it isnt fastened except to neutral bar .

Is that empty hole above it where it usually goes?
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Old 11-02-2012, 11:24 PM   #5
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I am young. So i have a question for the seasoned pros, was it legal back when to put both neutrals and grounds on the same block in the main service panel?
If not... I see a problem.

Relating to your question, installing a bond screw could be tricky, as the original panel would have come with one installed it would have been of a certain size and thread.
My first guess to where it belongs is one of the 3 holes i can see in the neutral block from your pics.
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Old 11-02-2012, 11:29 PM   #6
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yes they did that on older panels .not on new homes now though.
see the next article has same box type similar set up

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Old 11-03-2012, 06:29 AM   #7
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Neutral and grounds can be terminated in the same buss bar in a Main panel if it is the first disconnecting means for a structure.

After that they are isolated from each other, such as in a sub panel.
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Old 11-03-2012, 06:32 AM   #8
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Quote:
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yes they did that on older panels .not on new homes now though.
Um, please do not give advice if you do not know the NEC or standard practices.
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Old 11-03-2012, 06:34 AM   #9
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Quote:
Originally Posted by Marc05 View Post
I am young. So i have a question for the seasoned pros, was it legal back when to put both neutrals and grounds on the same block in the main service panel?
If not... I see a problem.
Was and still is legal in a main panel, but a neutral and a ground can not be under the same terminal in the buss bar.
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Old 11-03-2012, 06:56 AM   #10
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Quote:
Originally Posted by Code05 View Post
Was and still is legal in a main panel, but a neutral and a ground can not be under the same terminal in the buss bar.
More specifically, each neutral must have its own hole or screw in the bus bar.

Two grounds (equipment grounding conductors) can share a hole although this often does not work well if the wire ends are of different gauge.

By the way, do you have a proper grounding electrode conductor leaving the panel from the neutral/ground bus bars? The aluminum rod can be the GEC provided it runs non-stop to a ground rod or to a metal cold water pipe within 5 feet of where the pipe exits the house as metal (as opposed to plastic pipe) underground, without an indoor water meter in between. It needs to be 4 gauge (6 gauge for copper GEC) for services up to 100 amps. With rare exceptions the completed grounding electrode system requires two 8 foot ground rods; use additional #6 copper to connect these to the panel or to an existing GEC.
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Last edited by AllanJ; 11-03-2012 at 07:14 AM.
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Old 11-03-2012, 07:04 AM   #11
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Quote:
Originally Posted by AllanJ View Post
More specifically, each neutral must have its own hole or screw in the bus bar.

Two grounds (equipment grounding conductors) can share a hole although this often does not work well if the wire ends are of different gauge.
Correct, but the technical word for the hole and screw is terminal.

408.41 Grounded Conductor Terminations. Each grounded
conductor shall terminate within the panelboard in an individual
terminal that is not also used for another conductor.
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Old 11-03-2012, 08:46 AM   #12
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Quote:
Originally Posted by Code05 View Post
Neutral and grounds can be terminated in the same buss bar in a Main panel if it is the first disconnecting means for a structure.

After that they are isolated from each other, such as in a sub panel.
Cool, tks. I havn't done alot of residential, so I am out of the loop on little details like this. Although I use the CEC, not the NEC..
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Old 11-03-2012, 09:30 AM   #13
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Quote:
Originally Posted by Marc05 View Post
Cool, tks. I havn't done alot of residential, so I am out of the loop on little details like this. Although I use the CEC, not the NEC..
There really is no difference between residential and commercial, the wiring methods used may or may not differ, but the codes are the same regardless.
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Old 11-03-2012, 09:37 AM   #14
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Originally Posted by stickboy1375 View Post
There really is no difference between residential and commercial, the wiring methods used may or may not differ, but the codes are the same regardless.
Most panels in commercial would be more like a sub panel. You will not see that practice used nearly as much even though the codes are the same.

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