Bonding structural steel through slab in Div 1

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KentAT

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I was asked this question and I cannot answer it.

Does the practice of sleeving a structural steel grounding or bonding jumper through a poured concrete slab (using PVC SHC40 conduit for protection) violate any NEC code when leaving the interior of a Class1, Div 1 or 2 area? The jumper is typically attached to the plant's ground loop that is running throughout the plant. The point of connection is U/G, usually within 10 feet or so of the building walls.

I would think that there is no issue, but I can't answer "why" when someone brings up the question of sealing between the Div 1 interior and the unclassified U/G location of the tie-in.

Plant is a natural gas compressor station.

Kent


P1000790.jpg
 
KentAT said:
I was asked this question and I cannot answer it.

Does the practice of sleeving a structural steel grounding or bonding jumper through a poured concrete slab (using PVC SHC40 conduit for protection) violate any NEC code when leaving the interior of a Class1, Div 1 or 2 area? The jumper is typically attached to the plant's ground loop that is running throughout the plant. The point of connection is U/G, usually within 10 feet or so of the building walls.

I would think that there is no issue, but I can't answer "why" when someone brings up the question of sealing between the Div 1 interior and the unclassified U/G location of the tie-in.

Plant is a natural gas compressor station.

Kent


P1000790.jpg
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Grounding installation as you picture does not fall under the electrical requirements of the Art. 501 as far as intallation methods concerned.

A seal's function is to confine the potential explosion, that is the result of an electric arc and an explosive atmosphere, to within the enclosure or the conduit system. Since ground conductor such as shown is not normally current carrying, installed as an unswitched, passive system, it is not a source of heat or arcing therefore no restriction exist on its installation.

Equipment grounding conductor installed as part of and with the circuit conductors follow the 501 rules.
 
You got it Laslo,well said. A point to bring up here is that the sleeve is kick protection basically and should allways be PVC and not RMC, as a fault could choke at the RMC and burn thru compromizing the ground integrity.

dick
 
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