nkalghatgi
Member
- Location
- Mechanicsburg, PA, USA
What is the difference between ground wire; for example in a conduit if there are 4 #2 and 1 #2 ground wire; and equipment grounding conductor.
Perhaps it is me, but I do not understand your question.
Can you clarify what you are asking please?
That's fine. Perhaps I should re frame my question. What is a ground wire and what is an equipment grounding conductor.
That's fine. Perhaps I should re frame my question. What is a ground wire and what is an equipment grounding conductor.
What is the difference between ground wire; for example in a conduit if there are 4 #2 and 1 #2 ground wire; and equipment grounding conductor.
Bob, David,
I really appreciate your replies. That means the ground wire which we use in every conduit is actually Equipment Grounding conductor. As David stated 2#12 + #12 GND. In this case the #12 GND is actually equipment grounding conductor. Am I correct ? Please correct me if I am wrong.
Bob, David,
I really appreciate your replies. That means the ground wire which we use in every conduit is actually Equipment Grounding conductor. As David stated 2#12 + #12 GND. In this case the #12 GND is actually equipment grounding conductor. Am I correct ? Please correct me if I am wrong.
A lot of people including electricians who should know better use "ground" to refer to the grounded conductor, not the equipment grounding conductor.Yes, in most cases "ground" refers to an equipment grounding conductor. ....
is it earthing & bonding you are refering to here?...if so then both perform different functionsThat's fine. Perhaps I should re frame my question. What is a ground wire and what is an equipment grounding conductor.
One other thing to note, which works better if you know what is there but not the function, is:
The grounded conductor is usually white or grey
The equipment grounding conductor is typically bare or green or green with a yellow stripe, but could also be just a metal raceway.
The ground electrode conductor has no color requirement and could be bare. Some color it green. It usually isn't white.
Bonding jumpers are similar (no color requirement and could be bare. Some color it green. It usually isn't white.).
A lot of people including electricians who should know better use "ground" to refer to the grounded conductor, not the equipment grounding conductor.
There are a lot of places in the NEC where you could have bonding jumpers. They are between ground electrodes thereby creating the "ground electrode system". There is the main bonding jumper in a service disconnect between the grounded bar and the panel chassis. They could be between sections of pipe that have been isolated by a meter or dielectric fittings. They could go between a bonding bushing on a raceway fitting and the grounding bar or chassis/box.is this what we call in the UK `supplementary bonding conductors`...or more commonly refered to as `crossbonding`?
that is to say bonding 2 (or more) pieces of extranious conductive parts together so as to maintain the equepotential zone?
gas, water, oil etc being an example....
caus for a start if you have items of metallic equipment that doesn`t represent a path to earth that has been `bonded`such as stainless movable worktops in commercial kitchens etc (trust me..i`v seen it)...then its actualy introducing a potential...and as such i`v got really anoyed at this..(under my breath) when i`v encountered it.... and have disconnected it accordingly....
so dangerous...
no.There are a lot of places in the NEC where you could have bonding jumpers. They are between ground electrodes thereby creating the "ground electrode system". There is the main bonding jumper in a service disconnect between the grounded bar and the panel chassis. They could be between sections of pipe that have been isolated by a meter or dielectric fittings. They could go between a bonding bushing on a raceway fitting and the grounding bar or chassis/box.
I'm not sure we have a requirement to create a equipotential zone very often. Bonding a steel kitchen table would not be required unless it was "likely to become energized". If so, it needs to go to a panel ground system and not to earth. If it get energized to 120V or 240V, a connection to earth will most likely NOT trip an overcurrent device, so that is of no help. Yes, the grounding/bonding system can become energized under some fault conditions or during lightning storms, but that is what you need to bond things to. If things are correct, they overcurrent device should trip. Lightning is a different problem, but not sure what you can do about it, as it will do its own thing bonded or not.