Sub panel

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1

Originally Posted By: jane molina
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How does the wiring go for a subpanel? Is the sub main wired to


the main buss bar panel. Also never is the ground and neutral to be bondedi n the same panel as the subpanel , what does that mean bonded .Does anybody have a photo of a subpanel to main wiring that I can see clearly, it would very much help.


Jane

2

Originally Posted By: gbeaumont
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hi Jane,


Yes a sub panel is wired off a main panel.

In a sub the Neutral Bus should be isolated from the panel and there should be no connection (bond) between the neutral wires (or their bus) and the grounding conductors.

I looked to see if I had a photo showing a correctly wired main and sub, but can't find one.

regards

Gerry

--
Gerry Beaumont
NACHI Education Committee
e-mail : education@nachi.org
NACHI phone 484-429-5466

Inspection Depot Education
gbeaumont@inspectiondepot.com

"Education is a journey, not a destination"

3

Originally Posted By: kmcmahon
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Just out of curiosity Jane, are you a practicing HI or just learning?

–
Wisconsin Home Inspection, ABC Home Inspection LLC


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4

Originally Posted By: tschwalbe
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I have to agree with kevin.

5

Originally Posted By: jane molina
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Thanks Gerry , That was very helpful. Kevin and Todd , I just enjoy


learning about these thngs and other types of construction. I am


am fitness instructer and competing this year for miss fitness of


California . Thanks guys

6

Originally Posted By: rpalac
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Hi Gals and Guys,


(is that proper…I hope)


There are several ways that a sub panel can be wired. The wiring coming from the primary panel can be run from the same bus bar connections if they are properly rated for it. Most of the time the wiring from the primary panel is fed from a breaker suck as a 220volt 60amp or what ever your wiring and sub panel are rated at. (220v 100amp, 440v-200amp,on,and on, and on)

The wiring feeding into the second or correctly said, sub-panel, can also be landed the same way. It can either be connected to main lugs if you have them, a main breaker if so equipped or back fed thru a breaker making it the acting main. (The breaker doesn't care which way the voltage and current are coming it still reacts the same).

The grounding is different.

The primary or main panel has a bonded neutral and ground. This just means that they are both physically connected together by some means. Many panels have a bonding strip of wire or a bonding screw that physically goes through the neutral buss bar and connects to the grounded can of the panel. Some panels actually have a bar that does the same operation of connecting the ground bar to the neutral bar.
[That by the way is the definition of a bonded ground.........when the grounding bar (a.k.a. ground bus) is connected with the grounded bar (a.k.a. neutral bus bar) by a conductor].

The sub-panel or all sub panels are to be isolated from this method.
This means when you land each branch circuit into the sub-panels they have to have all of the grounding conductors (bare wires) landed on the grounding bus bar.
When you land all of the neutrals (grounded conductors-white wires) they are to be landed on a separate bus bar called the grounded or neutral bus.

You should now realize there is a difference of grounded and grounding.

There is a reason for this that is lengthy in explanation and has to do with current, impedance and EMF. Basically you can over heat the line serving the sub panel and burn up the service under the right conditions.

The way you can tell if the neutral bus is bonded or not is primarily a visual inspection. Many manufactures supply a screw that goes through the neutral bus bar and physically connects to the frame or can of the panel. Since the can is directly connected to the grounding bus you intern make a bonded connection.

You can electrically test for this as well but much more involved on a wired panel.

Gosh I hope this helped a little.

Bob p.

7

Originally Posted By: phinsperger
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800×640 83.5 KB











–
.



Paul Hinsperger
Hinsperger Inspection Services
Chairman - NACHI Awards Committee
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here !
8

Originally Posted By: kmcmahon
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Just curious Jane…good luck with the miss fitness thing…feel free to post your competition pictures…I’m sure we’d all like to see! icon_biggrin.gif

–
Wisconsin Home Inspection, ABC Home Inspection LLC


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9

Originally Posted By: jane molina
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Thanks Robert .


Todd I don’t think I should post any Miss fitness pictures on this message board but If I remember i will email you some , Thanks Jane

10

Originally Posted By: Guest
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So Kevin…she called you Todd. That must have a been a slap in the face.


Sincerely, Todd

11

Originally Posted By: tallen
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That’s not Fair Jane icon_biggrin.gif


Just post in the not for everyone section under >>dirty old HI’s


You hurt my feelings Chad. Unless of course your talking about the other Todd

--
I have put the past behind me,
where , however, it now sits, making rude remarks.

www.whiteglovehomeinspections.net

30 Oct 2003-- 29 Nov2005

12

Originally Posted By: kmcmahon
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It’s not like it’s the first time I’ve been called another name by a woman…usually it’s god. Then I just remind them to call me Kevin! icon_wink.gif

–
Wisconsin Home Inspection, ABC Home Inspection LLC


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13

Originally Posted By: tallen
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icon_lol.gif icon_lol.gif

–
I have put the past behind me,


where , however, it now sits, making rude remarks.


www.whiteglovehomeinspections.net

30 Oct 2003-- 29 Nov2005
14

Originally Posted By: charper
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Ok Kevin, wipe the dribble from your chin. Drool in the “spittal” chat room.


Charlie

15

Originally Posted By: Charles Byron
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When was this requirement adopted by the NEC?

16

Originally Posted By: rpalac
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If you send me the pictures I might not be able to work. Beside I’m to sexy for shirt, to sexy for my tape mesure, I’m, I’m to sexy for my inspection book…never mind just getting carried away, wrong song.


ps. did I tell you I was tall, dark, handsome and rich?

1 outta 4 aint bad

Can you lift me on your shoulders so I don't need a ladder on the next inspection....your hired....wera those cute thong things (if you don't mind I have a problem figuring out which side is the front so I ussually don't wear them)

17

Originally Posted By: Guest
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Kevin,


Hearing 'oh God, not so soon again" doesn't qualify as being called God.

18

Originally Posted By: jane molina
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You guys are too funny but alot of fun.


My apologies to you Kevin I ment you…not todd


Jane

19

Originally Posted By: jane molina
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Wish me luck everyone ,I will try and paste a pic on the not for everyone.


Jane

20

Originally Posted By: rpalac
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You Jane, Me wana be CHEETA. You drivin me bananas.


Wo, Jane.....not only the best of luck, but let me hold the door for you with pride.

Great picture!

I'm not afraid to say I'd be proud to stand next to you on the beach.

Ps. Let me know if you need a training partner....it's never to late for me to start. nice smile....very caprtivating.

Bob P.