Dale Hayes
Senior Member
NEC Article 250.12
(C) Multiple Circuits
If a single equipment grounding jumper is run with multiple circuits within the same raceway, cable, or cable tray, it shall be sized for the largest overcurrent device protecting conductors in the raceway, cable, or cable tray. Equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.3(B)(1)(c).
Question:
Can (1) equipment grounding jumper be used if there is more than one conduit run for the multiple circuits?
What we have is (8) 3-phase circuits in a electric heater unit - each protected by a 60 amp overcurrent device.
Because of the (24) 6Ga wires we have two conduit runs from the electric heater terminal enclosure going into an Industrial Control Panel. The EGC will originate at the electric heater and end up on the grounding device in the Industrial Control Panel.
All of the (8) 3-phase circuits originate from the same electric heater terminal enclosure. With two conduit runs there will be (4) 3-phase circuits in each conduit run.
Will (1) 10Ga EGC thru one of the "two conduits" be OK?
(C) Multiple Circuits
If a single equipment grounding jumper is run with multiple circuits within the same raceway, cable, or cable tray, it shall be sized for the largest overcurrent device protecting conductors in the raceway, cable, or cable tray. Equipment grounding conductors installed in cable trays shall meet the minimum requirements of 392.3(B)(1)(c).
Question:
Can (1) equipment grounding jumper be used if there is more than one conduit run for the multiple circuits?
What we have is (8) 3-phase circuits in a electric heater unit - each protected by a 60 amp overcurrent device.
Because of the (24) 6Ga wires we have two conduit runs from the electric heater terminal enclosure going into an Industrial Control Panel. The EGC will originate at the electric heater and end up on the grounding device in the Industrial Control Panel.
All of the (8) 3-phase circuits originate from the same electric heater terminal enclosure. With two conduit runs there will be (4) 3-phase circuits in each conduit run.
Will (1) 10Ga EGC thru one of the "two conduits" be OK?