Ohming

[Mr. E]

I have a commercial client who's outlets all ohm out to ground, regardless of where you are in the facility. Any help?

 

[jcassity]

does the hot leg have continuity to ground?
are all the O/L equipped with ground fault interrupt?

 

[kwired]

more details of what you are trying to accomplish and how you are doing it are necessary. If you are testing with loads still connected especially line to grounded conductor (neutral) loads, I am not surprised at all. You will read whatever resistance is in those loads through the load, then back on the grounded conductor (neutral) back to where that grounded conductor is bonded to the equipment grounding conductor and back through the equipment grounding conductor to your second meter test lead.

If you are searching for faults you have to disconnect paths that are intended current paths so you are only testing for unintended paths that may be there.

 

[jcassity]

im assuming he has everything unplugged from *ALL* outlets and the fault he describes exists now.

id think he would be tripping breakers as well

 

[kwired]

im assuming he has everything unplugged from *ALL* outlets and the fault he describes exists now.

id think he would be tripping breakers as well

Like I said, we need more information. We don't know what is being tested, whether it is energized, or for that matter exactly what testing methods are employed.

Generally resistance testing is going to involve isolating the item being tested so you don't get readings from something external from what is being tested, if little or no isolation has been done who knows what paths are showing up in his results that may not really be any problem.

Most any grounded system that has equipment operating from the grounded conductor will require isolation from the grounded/grounding bond point for such testing at the very least.

 

[petersonra]

I have a commercial client who's outlets all ohm out to ground, regardless of where you are in the facility. Any help?

they should be this way.

there is DC continuity through the source transformer to neutral which is bonded to ground.

 

[GoldDigger]

What is the source?
If the outlets (receptacles?) are fed from a local transformer then interrupting the primary will remove voltage but leave a wire connection through the secondary from hot to neutral. (Assuming single phase or wye.)


Tapatalk...

 

[jcassity]

100% agree kwired, need the 5w's provided

no sense in chasing baloons

 

[Mr. E]

Mr. E

Mr. E

Thanks for the feedback. All loads are energized, this is a manufacturing facility 24x7.

 

[K8MHZ]

I have a commercial client who's outlets all ohm out to ground, regardless of where you are in the facility. Any help?

Welcome to the forum.

I think it would help if you defined 'ohm out to ground'. Does that mean you are using a DVOM and seeing zero ohms from a conductor to the earth?

Or are you seeing some value, say 100 ohms from a conductor to the earth?

Or are you measuring from a conductor to the grounding conductor in a receptacle?

Or something maybe totally different?

 

[Jraef]

I have a commercial client who's outlets all ohm out to ground, regardless of where you are in the facility. Any help?

Thanks for the feedback. All loads are energized, this is a manufacturing facility 24x7.

These two statements taken together confuse me more than enlighten me. You have not explained what you mean by "ohmed to ground", now you say they are energized. You aren't trying to read ohms on a hot circuit are you? hmy:

 

[kwired]

exactly what two points did you connect meter leads to when doing your testing? and why did you connect to those points?

Typically a ground fault on an ungrounded conductor doesn't need to use an ohmmeter for initial indication there is a problem, the overcurrent device(s) will be first thing to indicate the problem.