Objectionable current

[joeyww12000]

What is the defintion of "objectionable current"? I have the Mike Holt "Basic Electrical Theory" book, and there are illustrations on this. Is objectionable current a NEC Definition? I understand it to be current traveling on a improper conductor under normal operating conditions, such as EMT conduit containing a branch circuit. When you bond the grounded conductor of a SDS at both the transformer and at the panel with a conductive path between the bonds, Do you have objectionable current returning on the conductive path, lets say EMT between the transformer and panel,.....? or can there be objectionable current? Im going by the illustrations in the book and there are some situations at my work where this is the case with a few xfmers. I know the install is not right, but how do you check for voltage on a panel casing, unless you touch it and get zapped? I cant use a multimeter and check neutral to case ground or EMT since there at the same potential....I could put a stick type tester to the can I suppose? The bottom line is I know the install of the SDS isnt correct, but when they start putting loads on these conductors and nothing happens I dont want to look like an idiot...since the inspector passed all this already, without even taking any covers off of anything.

 

[joeyww12000]

Sorry for the idiocy, dont answer how to check voltage on this question....Im looking for current...amps.. Im an idiot....to early... If I want to check for current all I would have to do is take loose the system bonding jumper, place one lead to the end of it and one lead to the can, leaving in the bonding screw. If there is a load on one of the circuits in the panel I should be able to read amps shouldnt I?

 

[brian john]

You can
1. Measure current on the neutral to ground bond.
2. Perform a zero sequence test.

 

[cripple]

Objectionable current

Objectionable current are not defined be the NEC. I how submitted two proposals to try to define objectionable current, to no vela, which is very frustrating when even the Code Panels can or will not help the code user. I feel without a clearer definition 250.6 is totally unenforceable. It would easer to enforce if 250.6 would referee to parallel paths instead of objectionable currents.