jcfoley
Mechanical
- Feb 18, 2005
- 90
I hope you folks can help me out here. I am a mechanical engineer but have had to deal with controls for quite a few years. I now have an electrical PE pounding me for information on grounding/bonding practices. I have seen this done several different ways. I know that NEC requires equipment housings and conduit to be grounded but it never really says how this is to be done. Here is the situation.
1. The equipment housing ground screw is connected to a ground wire and brought back to the panel ground.
2. Rigid conduit is installed to the equipment.
3. Liquidtight conduit is used to make the connection to the panel.
Questions
1. Is a separate external bonding jumper required for the liquidtight section?
2. If I use an external bonding jumper on the liquidtight section, can I eliminate the ground wire inside the conduit (thereby using the rigid conduit as the equipment grounding conductor?
3. If I gound the equipment housing directly to the equipment skid via an external grounding terminal, is any of the above necessary?
Any suggestions are welcome.
1. The equipment housing ground screw is connected to a ground wire and brought back to the panel ground.
2. Rigid conduit is installed to the equipment.
3. Liquidtight conduit is used to make the connection to the panel.
Questions
1. Is a separate external bonding jumper required for the liquidtight section?
2. If I use an external bonding jumper on the liquidtight section, can I eliminate the ground wire inside the conduit (thereby using the rigid conduit as the equipment grounding conductor?
3. If I gound the equipment housing directly to the equipment skid via an external grounding terminal, is any of the above necessary?
Any suggestions are welcome.