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Thread: Grounding/Bonding

  1. #1

    Grounding/Bonding

    Ok...here I go. Meter is grounded with 8' grounding rod. Circuit breaker box is bonded to meter via conduit. Grounding rod to meter is # 4 wire and is connected to neutral lug in meter box. Circuit breaker box is grounded to cold water pipe at entrance to house. Water meter is jumped with bonding jumper. Grounding wire from cold water pipe to circuit breaker box is connected to the grounding bus bar. The circuit breaker box is bonded to the rest of the system via bonding jumper from the meter conduit lug to the panels neutral buss bar, then from neutral buss bar to the panels bonding buss bar. Is this correct? And is my terminology correct?

  2. #2
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    Quote Originally Posted by VIC1958 View Post
    Ok...here I go. Meter is grounded with 8' grounding rod. Circuit breaker box is bonded to meter via conduit. Grounding rod to meter is # 4 wire and is connected to neutral lug in meter box. Circuit breaker box is grounded to cold water pipe at entrance to house. Water meter is jumped with bonding jumper. Grounding wire from cold water pipe to circuit breaker box is connected to the grounding bus bar. The circuit breaker box is bonded to the rest of the system via bonding jumper from the meter conduit lug to the panels neutral buss bar, then from neutral buss bar to the panels bonding buss bar. Is this correct? And is my terminology correct?
    It is legal as you described although the terminology is a bit sketchy. Also, the #4 to the ground rod only needs to be #6 no matter what size service you have.

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    Jack Sprat Electric

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    Answers based on the 2008 NEC Edition when I think to grab that one.

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    Quote Originally Posted by VIC1958 View Post
    Ok...here I go. Meter is grounded with 8' grounding rod. Circuit breaker box is bonded to meter via conduit. Grounding rod to meter is # 4 wire and is connected to neutral lug in meter box. Circuit breaker box is grounded to cold water pipe at entrance to house. Water meter is jumped with bonding jumper. Grounding wire from cold water pipe to circuit breaker box is connected to the grounding bus bar. The circuit breaker box is bonded to the rest of the system via bonding jumper from the meter conduit lug to the panels neutral buss bar, then from neutral buss bar to the panels bonding buss bar. Is this correct? And is my terminology correct?
    Dennis is being nice, the terminology is confusing when interlaced between mentioning the circuit breaker box and later mentioning panels neutral buss bar and bonding buss bar in the same sentence as bonded together. So is the Service main disconnect a back-to-back...(I.e. the meter main 4-wire to the panel board?) Is there a UFER also? Is the water pipe bonding within 5' of the foundation exit? The #4 tells me something is over-designed or the installer not confident in what the local AHJ has adopted.
    rbj, Seattle...Safety is a Professional Courtesy.

  5. #5
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    It appears you have it covered, but a few comments.
    250.24 requires a connection between the grounded conductor and the grounding conductors and the service enclosure. This is the "main bonding jumper" It appears you have that. The "link" to the metallic service conduit is one method of complying with 250.92.
    250.24 states the grounding electrode conductor is to connect to the grounded conductor at a point up to the buss to which the grounded conductor is terminated. If the metallic water pipe is a grounded electrode, some inspectors would not accept your grounding electrode conductor being attached to the grounding buss.
    You did not mention service conductor size or grounding electrode conductor size so that can not be verified, and, as mentioned, other electrodes, if present, would have to be addressed.
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  6. #6
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    Quote Originally Posted by Dennis Alwon View Post
    It is legal as you described although the terminology is a bit sketchy. Also, the #4 to the ground rod only needs to be #6 no matter what size service you have.
    Our POCOs require a #4 cu to the ground rods. They have this published in their bulletins they hand out to electrical designers, installers and inspectors.
    Answers based on the 2008 NEC Edition when I think to grab that one.

    What you are, you are by accident of birth; what I am, I am by myself. There are and will be a thousand princes; there is only one Beethoven. Ludwig van Beethoven



  7. #7
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    Quote Originally Posted by wbalsam1 View Post
    Our POCOs require a #4 cu to the ground rods. They have this published in their bulletins they hand out to electrical designers, installers and inspectors.
    Hey Jack Spratt, I can only speak for the NEC. What individual counties, states, poco's etc require is always a force to be reckoned with.

  8. #8
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    The circuit breaker box is bonded to the rest of the system via bonding jumper from the meter conduit lug to the panels neutral buss bar,
    That would be a fail here. No such connection to the meter is allowed. Bonding must be done in the enclosure that houses the first disconnect. Panel bonding is usually done with the green screw supplied with the panel for just such use.
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  9. #9
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    Quote Originally Posted by K8MHZ View Post
    That would be a fail here. No such connection to the meter is allowed. Bonding must be done in the enclosure that houses the first disconnect. Panel bonding is usually done with the green screw supplied with the panel for just such use.
    2nd
    PPL (POCO) also does not allow GEC to be landed in meter base must be in first disconnect enclosure. Southeastern, PA area
    I must be getting wiser. The more I know the more I know I know nothing.

  10. #10
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    Quote Originally Posted by VIC1958 View Post
    Ok...here I go. Meter is grounded with 8' grounding rod. Circuit breaker box is bonded to meter via conduit. Grounding rod to meter is # 4 wire and is connected to neutral lug in meter box. Circuit breaker box is grounded to cold water pipe at entrance to house. Water meter is jumped with bonding jumper. Grounding wire from cold water pipe to circuit breaker box is connected to the grounding bus bar. The circuit breaker box is bonded to the rest of the system via bonding jumper from the meter conduit lug to the panels neutral buss bar, then from neutral buss bar to the panels bonding buss bar. Is this correct? And is my terminology correct?
    Assuming that you have a meter enclosure next to you service disconnect switch here in NYC you should brink your water ground wire to the neural bar of you first SDS ( main breaker panel) then install your main bonding jumper from the neutral bar to the enclosure or grounding bar( size it based on the table 250.66) and connect your electrode wire ( wire comming from your ground rod #6 is the maximum size require per NEC)to the grounding bar or to the enclosure . If you have metallic conduit from the meter can to the panel ,you should bond it to the neutral bar or to the enclosure or to the grounding bar(size based on table 250.66) wrigting from my phone hope you understand it THX

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