Grounding box connectors?

Status
Not open for further replies.
E

electricaldoc

Member
Grounding box connectors?

While wiring up an E-stop at my work. It suddenly accrued to me. How do you ground the box connectors on this? The box is plastic, and all other components are plastic. The two box connectors are metal, and with SOOW cord running threw them they could become energized. So this would mean they need to be grounded, but how? I am using stranded wire so wrapping wire around connector very messy. I do not know of anything that I can put on connectors to bond then to bounding conductor. Any input on how to do this?

Also does anyone know do they make a wrench or something to tighten box connectors with? We use cannel locks, or screw drivers and small hammers, but is there a correct tool made for this? :confused:
 
Re: Grounding box connectors?

I've got a couple 1/2" bonding busings in my van. Is that what you're asking about to bond the connector?
 
Re: Grounding box connectors?

Pierre,
The fitting in this example is not required to be bonded, and yes they do make a tool for tightening the locknut of these fittings.
Click to expand...
Why not?
Don
 
Re: Grounding box connectors?

Yes I am confused too. doesn't any metal that can become energized need to be grounded? could these metal box connectors with soow cord running threw them become energized? I have seen it before.

Also at my work place nonconductive connectors are not an option sense we must use what they buy.

Where can I find one of these wrenches for box connectors?
 
Re: Grounding box connectors?

250.4 ... (3) Bonding of Electrical Equipment. Non?current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path. ...
Click to expand...
I don't see any exceptions to this rule.
Don
 
Re: Grounding box connectors?

Originally posted by don_resqcapt19:
250.4 ... (3) Bonding of Electrical Equipment. Non?current-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the electrical supply source in a manner that establishes an effective ground-fault current path. ...
Click to expand...
I don't see any exceptions to this rule.
Don
Click to expand...
doesn't this its self mean that an effective path to carry unwanted current back to ground.
If metal conectors are attached to plastic box and nothing else then if current carrying conductor became in contact with connector which is not grounded then it would have no way to return it to ground and connector it's self would be "live".
Am I misunderstanding this some how?
 
Re: Grounding box connectors?

Stahlin is major manufacturer of fiberglass enclosures, their technical information says in part "Grounding continuity must be maintained between the equipment in the enclosure and the conduits or cables entering and exiting the enclosure..."
and hubs "... for use in fiberglass enclosures must have built-in grounding screws to comply with UL and NEC requirements."
 
Re: Grounding box connectors?

Another application where this same problem comes up in the installation of pushbuttons, selector switches, and pilot lights that have exposed metallic parts in a nonmetallic box. In some cases you can use a jumper to bond the exposed parts and in other cased the design of the device makes bonding impossible. The best choice would be to use nonmetallic devices and fittings when using nonmetallic boxes.
Don
 
Status
Not open for further replies.
Top