Equipotential bonding bonded to service ground

[valassi]

680.26(B) States:
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.

My question: If we have an open neutral in the wiring premises, having the equipotential bonding bonded to the service grounding conductor will limit the electrical hazard?

 

[GoldDigger]

680.26(B) States:
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.

My question: If we have an open neutral in the wiring premises, having the equipotential bonding bonded to the service grounding conductor will limit the electrical hazard?

Hmm.
Depending on the exact details of the wiring, the location of the open neutral, and the exact map of where all of the earth electrodes happen to be, the results could go either way.

It might increase the chances of shock in the pool area, just outside the equipotential grid, but it might also decrease the hazard of shock from the nominally grounded but actually at a higher potential due to ground current metal in other areas of the building.

Breaking that down:
It will improve the quality of the earth ground connection in the rest of the building by adding more parallel earth electrodes to the system, for whatever that may be worth, and
it will cause more current to flow through the earth grounding system, including everything around the pool, for whatever risk that might cause.

Since the presence of an open supply neutral will not immediately cause any protective devices to trip, the initial concern will be stray voltage limitation rather than fault clearing.

 

[don_resqcapt19]

There will be a connection to the electrical grounding system. The pool bonding system is required to be connected to the non-current carrying metal parts of pool system electrical equipment and those non-current carrying parts will be connected to an EGC. The code does not intend that the pool bonding system be isolated from the electrical system, it just doesn't require you to extend the solid #8 back to a panel.

 

[valassi]

What I am saying is that this connection reduce the electrical hazards

 

[valassi]

And think about that the open neutral is in the neighbor premise wiring

 

[Sahib]

My question: If we have an open neutral in the wiring premises, having the equipotential bonding bonded to the service grounding conductor will limit the electrical hazard?

Connection to the EGC at moderately long distance from service neutral, IMO, because then there would be lesser possibility of considerable current injection into the equi-potential pool bonding metal in case of service neutral break.

 

[valassi]

Bonding

Bonding

NEC requires that ALL grounding systems in the premise must be bonded, the pool equipotential bonding itself is a grounding system.

 

[don_resqcapt19]

NEC requires that ALL grounding systems in the premise must be bonded, the pool equipotential bonding itself is a grounding system.

The pool bonding system is just that...a bonding system. It is not a grounding electrode. It will be bonded to the electrical system via the EGC for the pool equipment. Nothing more is required.

 

[kwired]

And think about that the open neutral is in the neighbor premise wiring

The pool bonding system is just that...a bonding system. It is not a grounding electrode. It will be bonded to the electrical system via the EGC for the pool equipment. Nothing more is required.

Don kind of hit what I was going to say. That equipotential bonding system doesn't care what voltage may be imposed on it, it's purpose is to equalize potential between objects within reach of the users of the pool. You could have that entire pool operating at 7200 volts above ground because of a problem with POCO distribution system, but everything within reach of users is all at same potential and they are not effected - just like a bird sitting on an overhead line is isolated from other potential. If you can't touch two points of different potential then you are not subjected to any voltage, and with no voltage there is no current flow through your body.

 

[valassi]

that is the point