Can you use a equipment grounding conductor as a means of a bonding jumper for conduit. I have always used a separate wire for the bonding jumper.
If sized correctly, then yes.
Note: Not sure what the voltage is, or what wiring method that is, from pic. Not sure why it requires bonding.
Where the Feed Ground is installed is called the Ground Point. Such as a Control Panel Feed Power lands on the Main CB or Fused Disconnect Switch, the Feed Ground is bolted onto the Sub-panel. Usually there is a Ground Bar associated elsewhere on the same Sub-panel for all the other Ground connections. The Enclosure itself is grounded via one of the Sub-panel mounting studs with a star washer to penetrate through the enamel. The Panel Doors are connected to the Sub-panel either by the Ground Bar or its own bolt. When using Standard Terminal Blocks, there are special one colored Green/Yellow whereby the Terminals are connected to the TB fastener (inside the TB) mounted on a Din Rail, screwed onto the Sub-panel. The common theme is "Ground Point" is the Sub-panel.
Whatever the Multi-conductor Cable is (Motor, another Panel or J-Box, or Power, or anything) - That Green Wire needs to be connected to Ground Point - not through the next Green Wire connecting the Conduit to a Ground Point. Ground cannot be daisy chained. If that location in the pic is the only Ground connection for the System shown - I don't believe you.
What Mr. Cramer is saying is to read 408.40. Ultimately, the green wire must make it to the terminal bar. But yes, it can be used to bond the conduit.
As to Nick's question about "is bonding required". I may be wrong, but if the metal raceway is connected to the enclosure through a concentric knockout isn't a bonding jumper required? If the knockout is an eccentric style, then a bond is not required?
Hi Rich. Many times transformer details - drawn by registered design professionals, spec out what is shown in the picture. We don't know from the information that provided whether or not bonding is required. Heck, we don't even know if this is service equipment.
If the Raceway is to serve as the EGC -
Upon closer inspection, I think the OP's Pic is showing the Insulation of the Ground Wire removed at the Conduit Ground Terminal. While I have never qualified this method as a solution under any circumstance - apparently it is acceptable however, I'm not seeing the OP's Pic as complying with any of these scenarios.
I don't think we can "guess" what his scenario is. If we do that, we will go on and on and the entire thread becomes nothing but gibberish. I've seen what he posted, yes the insulation is removed. I've seen this done quite a bit.
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