Originally Posted By: pabernathy
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The grounded (often a neutral) conductor can generally be connected to the ground only at the service disconnecting means neutral bus [see 250.24(A)(5) and 250.142(B)]. The main bonding jumper at the service connects the grounded conductor and equipment grounding conductor together at that point. The main bonding jumper serves as a vital link in the ground-fault current path from the service disconnect to the source windings (usually a utility transformer). . Sometimes through error or ignorance, the grounded (neutral) conductor and equipment grounding conductor are connected together on the load side of the service disconnecting means which violates the general requirements of 250.24(A)(5). This is often referred to as a false or bootleg ground and can create unwanted or objectionable current in the grounding circuit. If the grounded conductor and equipment grounding conductors are connected anywhere else in the building, all grounded metal can become part of the grounded (neutral) conductor return circuit for unbalanced neutral current that can create various voltage potentials on electronic equipment. When using common receptacle testers, this condition typically shows up as normally wired.
Here is where the hazzard lies : "If the grounded conductor and equipment grounding conductors are connected anywhere else in the building, all grounded metal can become part of the grounded (neutral) conductor return circuit for unbalanced neutral current that can create various voltage potentials on electronic equipment"
Now...enough of the verbal mumbo jumbo.....here is the skinny on the subject. You have a circuit that tests as NO ground...yet it probably has a 3 plug recept in it......I would cite that as a violation and explain to them you concerns...YOU have to be tactful as we all know referals are you best resource and scaring someone will not get you another call from the agent that hired you.....
So I would note it as a hazzard that warrants review as soon as possible from a licensed electrician and is about all you can do really....Now the electriican will come and pull the plug itself...check for grounding visually and then check it again with meters....but I can't tell you it is a hazzard that is so urgent that it can't wait for an electrician to check it but it does need to be a priority issue reported on your report.
You may have what bking has stated in that the ones that check out fine may in fact be a bootleg as described above ( which is not my definition mind you... ) so an electrician will be able to verify this by not only checking the system itself but the connections as well.
You stated that the grounds all look fine, can you verify the house was rewired....versus just a simple upgrade of the service system....big difference you know.....
At any rate.....I would note it as ODD and not normal and again refer it to an electrician....IF the recepts in the home are 3 hole models which I will assume....since you did not state otherwise and in most remodels they would be...something smells here.....most certainly note that also and have a electrician look a that as well.
Paul W. Abernathy- NACHI Certified
Electrical Service Specialists
Licensed Master Electrician
President of NACHI Central Virginia Chapter
Moderator @ Doityourself.com
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