Bonding Service

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benmt

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Location
nebraska
I'm a little confused on this situation. Your main service panel is piped with metal conduit from the meter to the service. The main service needs to have the bonding screw installed. In this situation doesn't installing the bonding screw parallel the neutral because of the metal conduit running from the meter to the service. I see it as the metal conduit "in a way" making it a four wire system.

Thanks
Ben
 

infinity

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Location
New Jersey
Occupation
Journeyman Electrician
Yes it does but when using a metallic service raceway it cannot be avoided. If you had a PVC raceway and ran a fourth conductor then you would have to deal with 250.6.
 

benmt

Member
Location
nebraska
All the grounds are paired up with the neutrals on the neutral bar, so is the bond screw necessary? All it's really doing is connecting the can and metal raceway to the neutral.

Ben
 

ActionDave

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Durango, CO, 10 h 20 min from the winged horses.
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Licensed Electrician
All the grounds are paired up with the neutrals on the neutral bar, so is the bond screw necessary?
Yes.
All it's really doing is connecting the can and metal raceway to the neutral.
That is what needs to be done. If you take a look at 250.92 you will see some more requirements for "extra" bonding at the service.
 

infinity

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Location
New Jersey
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Journeyman Electrician
All the grounds are paired up with the neutrals on the neutral bar, so is the bond screw necessary? All it's really doing is connecting the can and metal raceway to the neutral.

Ben

The metal enclosure needs to be grounded which is accomplished by connecting it directly to the service neutral via the bonding screw.
 

John120/240

Senior Member
Location
Olathe, Kansas
All the grounds are paired up with the neutrals on the neutral bar, so is the bond screw necessary? All it's really doing is connecting the can and metal raceway to the neutral.

Ben

If by "paired up" you mean under the same screw, you have a code violation FYI

electronfelon I read it the same way. benmt on your neutral bus one neutral per hole on the bus. As for grounds you can double up provided both wires are the same AWG.
 

shortcircuit2

Senior Member
Location
South of Bawstin
All the grounds are paired up with the neutrals on the neutral bar, so is the bond screw necessary? All it's really doing is connecting the can and metal raceway to the neutral.

Ben

That main bonding jumper can be your most important connection of your equipment grounding system to the grounded conductor of the AC supplied service to a building in some main disconnect equipment configurations. Without that bond there may not be an effective low impedance ground-fault path back to the source to cause an overcurrent device to clear. This will present a hazard if metal parts of an electrical system were to become energized by the ungrounded conductor.
 
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