Bare Copper Ground

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KasseemF

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Is it a requirement of the code thata the ground in nonmetalic conduit be bare copper?

Is it is safer in terms of lowering impedance for the ground in a nonmetalic conduit to be bare copper?
 
KasseemF said:
Is it is safer in terms of lowering impedance for the ground in a nonmetalic conduit to be bare copper?
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An insulated ground wire would have a slightly different value of distributed capacitance than a bare wire but I can't imagine this effect to be significant for reasonable cable lengths.
 
Additional Bonding Conductor

Additional Bonding Conductor

ActionDave said:
No. Not an NEC requirement.
No. I can't think of any benefit. Maybe cost.
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Would it be safe to assume that the same answer would apply for an additional bonding conductor in non metalic conduit for a piece of pool equipment?
Thanks
 
Pool EGC/Bonding

Pool EGC/Bonding

jumper said:
You are correct. Article 680 EGCs must be insulated.
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That's what I was thinking, but I have an "engineer" who is wanting an insulated conductor for "grounding" and a bare conductor for "bonding" in this branch circuit, 20A/120V plug connected load, with the branch circuit in Sched. 40 PVC and I'm trying to figure out what he's thinking.
Thanks Again
 
jsharvey said:
That's what I was thinking, but I have an "engineer" who is wanting an insulated conductor for "grounding" and a bare conductor for "bonding" in this branch circuit, 20A/120V plug connected load, with the branch circuit in Sched. 40 PVC and I'm trying to figure out what he's thinking.
Thanks Again
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680.25 Feeders. These provisions shall apply to any feeder on the supply side of panelboards supplying branch circuits for pool equipment covered in Part II of this article and on the load side of the service equipment or the source of a separately derived system.
(A) Wiring Methods.
(1) Feeders. Feeders shall be installed in rigid metal conduit or intermediate metal conduit. The following wiring methods shall be permitted if not subject to physical damage:

  1. Liquidtight flexible nonmetallic conduit
  2. Rigid polyvinyl chloride conduit
  3. Reinforced thermosetting resin conduit
  4. Electrical metallic tubing where installed on or within a building
  5. Electrical nonmetallic tubing where installed within a building
  6. Type MC cable where installed within a building and if not subject to corrosive environment
Exception: An existing feeder between an existing remote panelboard and service equipment shall be permitted to run in flexible metal conduit or an approved cable assembly that includes an equipment grounding conductor within its outer sheath. The equipment grounding conductor shall comply with 250.24(A)(5).
(2) Aluminum Conduit. Aluminum conduit shall not be permitted in the pool area where subject to corrosion.
(B) Grounding. An equipment grounding conductor shall be installed with the feeder conductors between the grounding terminal of the pool equipment panelboard and the grounding terminal of the applicable service equipment or source of a separately derived system. For other than (1) existing feeders covered in 680.25(A), exception, or (2) feeders to separate buildings that do not utilize an insulated equipment grounding conductor in accordance with 680.25(B)(2), this equipment grounding conductor shall be insulated.
(1) Size. This conductor shall be sized in accordance with 250.122 but not smaller than 12 AWG. On separately derived systems, this conductor shall be sized in accordance with 250.30(A)(8) but not smaller than 8 AWG.
(2) Separate Buildings. A feeder to a separate building or structure shall be permitted to supply swimming pool equipment branch circuits, or feeders supplying swimming pool equipment branch circuits, if the grounding arrangements in the separate building meet the requirements in 250.32(B). Where installed in other than existing feeders covered in 680.25(A), Exception, a separate equipment grounding conductor shall be an insulated conductor.
680.26 Equipotential Bonding.
(A) Performance. The equipotential bonding required by this section shall be installed to reduce voltage gradients in the pool area.
(B) Bonded Parts. The parts specified in 680.26(B)(1) through (B)(7) shall be bonded together using solid copper conductors, insulated covered, or bare, not smaller than 8 AWG or with rigid metal conduit of brass or other identified corrosion-resistant metal. Connections to bonded parts shall be made in accordance with 250.8. An 8 AWG or larger solid copper bonding conductor provided to reduce voltage gradients in the pool area shall not be required to be extended or attached to remote panelboards, service equipment, or electrodes
 
ActionDave said:
Thanks for that. High today is predicted to be around fifty degegrees, low about twenty. No reason to get in any water besides a hot shower.
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Go up-mountain in a few weeks and you will see people in outdoor pools at night when the temperature is 30 or 40 degrees colder! And paying lot's of money to do it.
 
Speedskater said:
Go up-mountain in a few weeks and you will see people in outdoor pools at night when the temperature is 30 or 40 degrees colder! And paying lot's of money to do it.
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I know, those people are nuts. Some of them pay good money to stick flat boards on their feet and go screaming down a snow packed mountain hoping not to break their necks.
 
I ran alot of the lightning protection at DU. We ran a straight shot to earth (lightning system) of bare 3/0 copper in rigid conduit .We attached to the red iorn beams.
Although it touches other things on the way down. It will likely stay with the 3/0 copper because it is the quickest way to the source(and ground)
 
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