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Bonding utility secondary raceway

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dnbob

Senior Member
Location
Rochester, MN
Can a 6' piece of seal tite used for a secondary raceway from utility for temp. power panel be bonded from bond bushing to the neutral lug of the meter socket, or is it "required" to be bonded to the skin of the can, which essentially is the same thing?
 
tom baker

tom baker

First Chief Moderator & NEC Expert
Staff member
Location
Bremerton, Washington
Occupation
Master Electrician
Re: Bonding utility secondary raceway

What is a secondary raceway?
What on the seal tite are you bonding? Do you have bonding liquidtight connectors?
See 230.43 (15).
Why not use liguid tite non metallic flex and then it does not have to be bonded.
 
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websparky

Senior Member
Location
Cleveland, Ohio
Re: Bonding utility secondary raceway

Hummm.... I'm not so sure it has to be bonded at all? It does need to have an EGC installed....

If you were to bond it, the bonding jumper would be landed in the grounding bus bar.
 
charlie

charlie

Senior Member
Location
Indianapolis
Re: Bonding utility secondary raceway

It does need to have an EGC installed....
Click to expand...
Dave, I am assuming that this is for the service lateral to a temporary service. If this is on the IPL (and any other electric utility that I am familiar with) a grounding conductor is strictly prohibited.

The general rule is that everything on the line side of the service point is grounded to the MGN. The grounding conductor is derived at the service disconnecting means. :D
 
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dnbob

Senior Member
Location
Rochester, MN
Re: Bonding utility secondary raceway

O.K., I guess I need to clarify this. Charlie's first paragraph is correct, it is a 6' piece of liquid tite metallic raceway. It does need a bond bushing in the meter socket, just wondering if it really mattered if it was bonded to the neutral lug or if it was required to be bonded directly to the meter can itself. Non-metallic raceway would take 2 days to get, and I do not have grounding type locknuts. I am bonding the metal portion of the raceway, Tom. Keep in mind this is unfused power. (There is pvc between the metersocket and main disconnect panel). Charlie what does MGN stand for?

Sorry for the confusion! :confused:

Sorry for any confusion.
 
tom baker

tom baker

First Chief Moderator & NEC Expert
Staff member
Location
Bremerton, Washington
Occupation
Master Electrician
Re: Bonding utility secondary raceway

"Tom. Keep in mind this is unfused power". Sure, but the allowed types of raceways are given in 230.43, including Non Metallic Liquid Tight Conduit, unless local codes apply.
 
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websparky

Senior Member
Location
Cleveland, Ohio
Re: Bonding utility secondary raceway

Hi Charlie,

You are correct in your view! I was going with
used for a secondary raceway from utility for temp. power panel
Click to expand...
as meaning after the utility main disconnect to the temp power panel. The "secondary" is what I assumed to be as "after". :confused:
 
B

bennie

Esteemed Member
Re: Bonding utility secondary raceway

The utility secondary is the primary to a residential distribution transformer.

The secondary of a distribution transformer is the service feeder supply.

The conduit in question is on the supply side.

A case can be the conduit is for protection against damage and is exempt from grounding.

A feeder wire making contact with the flex, will only burn clear, if the conduit is connected to the service neutral.
 
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dnbob

Senior Member
Location
Rochester, MN
Re: Bonding utility secondary raceway

So am I correct that it is necessary to bond the metallic raceway to the neutral in the meter can?
 
iwire

iwire

Moderator
Staff member
Location
Massachusetts
Re: Bonding utility secondary raceway

Originally posted by dnbob:
So am I correct that it is necessary to bond the metallic raceway to the neutral in the meter can?
Click to expand...
Bond it to either the meter can or to the neutral.

If there is a open terminal to connect it to the neutral that would be a more direct connection.

MGN is what you are calling the neutral, IMO it is MGN until you bond it at the service panel, at that point you have a grounded conductor and a grounding conductor.

That said I like Tom's suggestion of non metallic flex, nothing to bond.

[ April 10, 2004, 06:20 AM: Message edited by: iwire ]
 
charlie

charlie

Senior Member
Location
Indianapolis
Re: Bonding utility secondary raceway

Bonding is required and checking for the serving electric utility's requirements are also required. This particular utility may require metal for a bit more protection of the conductors. Notice what Bennie said, we are interested in a fault burning clear instead of interrupting service for any other customers on that transformer.

MGN is an acronym for Multi-Grounded Neutral. :D
 
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