Article 680 versus Article 250

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benjamin8761

Sr Electrical Engineer
Location
Laconia
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Electrical Engineer, PE
Article 680 does not require the Equipotential Bonding to be tied back to remote panels, service equipment or electrodes 680.26,b.

However Article 250 requires all grounding electrode systems that are present at each building to be bonded together (250.50)

Does article 250 require the Equipotential Bonding Plane to be bonded to the grounded electrode system.

Should the Equipotential Bonding be tied to the grounding eectrode conductor
 
250.52 (A)2 Metal In Ground Support or 250 (A)3 Concrete Encase Electrode

Would the equipotential Bonding not be considered a Grounding electrode requiring all to be tied together. The equippotentail Bonding fits the description.

If it is not a grounding electrode system - Should the Equipotential Bonding be tied back to the grounding electrode conductor
 
benjamin8761 said:
Would the equipotential Bonding not be considered a Grounding electrode requiring all to be tied together. The equippotentail Bonding fits the description.
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Except for it only being required to be #8 cu. which may or may not qualify as an EGC.
benjamin8761 said:
If it is not a grounding electrode system - Should the Equipotential Bonding be tied back to the grounding electrode conductor
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I would think only if there is a qualifying electrode within the pool's required perimeter.
 
I see no reason why it can't be connected to the grounding electrode conductor but it doesn't have to be. All the equipotential bonding does is keep any voltage around the pool area at the same potential. There is no reason to tie it to the grounding electrode conductor.
 
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680.26(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.
 
250.52(B) Not Permitted for Use as Grounding Electrodes.
The following systems and materials shall not be used as grounding electrodes:
(1) Metal underground gas piping systems
(2) Aluminum
(3) The structures and structural reinforcing steel described in 680.26(B)(1) and (B)(2)
 
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