do i need a seperate ground bus in the main panel

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Ok

Ok

Hmm. Is that due to the fact that now neutral current will now pass thru the panel enclosure to return to the source, and if you had a ?ground bar? bonded to the panel and a conductor connecting the two you would create a paralleled path. I understand now (I think:confused:). Like I said learn something new everyday.
 
seems like you have it ,.. the return current will take all paths back to the source ..

Now try this one on for size ,.. I'm wiring a kit/bath remodel,... the terminal screws on the neutral bar are FUBAR ( most will not back out, I think it must have been a glich at the factory) so I added an equipment groundig bar to free up some space for neutrals ,.. then I notice the service is emt with the service disconnect being the main of the panel

Once that bonding screw was driven , and we create the equipment grounding conductor, current will flow on the metal enclosure and the emt as they are now one. This is not a violation.
 
Potential

Potential

So you create a touch potential to the enclosure due to the neutral current that seeks the panel enclosure to the source (thru the green screw) as opposed to the conductor that ties the two bars togerther. therfore energizing the enclosure. pretty intresting thanks for all your replies on this topic it has been a learning experience.:grin:
 
Panel without ground bar

Panel without ground bar

I bought a Siemens 125amp 8/12 at the supply house. When I opened it up at the job there was no ground bar. There was however, a little package with a bonding jumper with the following instructions: use enclosed jumper if panel is to be used as service." Therefore, as sold it was set up not as a service panel but sold without a ground bar. Was it missing from the box or is it common to spend $50+ for a panel and then have to buy a ground bar?
 
Greg1707 said:
I bought a Siemens 125amp 8/12 at the supply house. When I opened it up at the job there was no ground bar. There was however, a little package with a bonding jumper with the following instructions: use enclosed jumper if panel is to be used as service." Therefore, as sold it was set up not as a service panel but sold without a ground bar. Was it missing from the box or is it common to spend $50+ for a panel and then have to buy a ground bar?
Click to expand...

Some brands include them, some don't. I usually get one just to be certain I have one, if it will be used as a non-service panel
 
;pet peeve.. there are at least two major brand load centers on the market that have a bar on one side, secured to the can, and an isolated bar on the other. Between them is a "tie strip" which when used as service is connected by a factory jumper utilizing a grren screw to the can. The jumper being held against the strip by the 10-32 screw is the only connection. Those of you who have installed these are aware, I' m sure.
There is no designitaion on the instruction tag as to one bar being neutral and one equipment ground. When the service bond jumper/screw is in place either bar is both. The current path in that case has always been a concern. It all depends on that one 10-32 screw remaining tight.
 
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