Equipment Bonding Jumper 250.30(A)(2)

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Mezani

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The wording in this "where a bonding jumper of the wire type is run" does this mean that EMT could be utilized as the conductor? 250.102 (A) is specific about the material.
 
infinity said:
That would be when the EBJ is not a screw, busbar, strap, etc.
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I disagree.

Although I would agree if you were talking about a SBJ .


Ibew441dc


edited to erase MBJ
 
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Mezani said:
The wording in this "where a bonding jumper of the wire type is run" does this mean that EMT could be utilized as the conductor? 250.102 (A) is specific about the material.
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Yes, the conduit between the transformer and the panel can be used as an equipment bonding jumper. This section is stating if you install an equipment bonding jumper of the wire type it must be sized in accordance with 250.102(C).

JMHO,

Chris
 
Difference between system and equipment bonding?

Difference between system and equipment bonding?

The illustration in 2005 handbook calls it a system bonding jumper and the Soares book on grounding calls it an equipment bonding jumper. Which is correct?
 
Mezani said:
The illustration in 2005 handbook calls it a system bonding jumper and the Soares book on grounding calls it an equipment bonding jumper. Which is correct?
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What exactly are we talking about?

The system bonding jumper is used to connect the equipment grounding conductors and the frame of the transformer to the derived grounded conductor.

The equipment bonding jumper is used to connect the equipment on the line side of the secondary overcurrent device.

250.30(A)(1) deals with the system bonding jumper and 250.30(A)(2) deals with the equipment bonding jumper. Very different things.

Chris
 
raider1 said:
The system bonding jumper is used to connect the equipment grounding conductors and the frame of the transformer to the derived grounded conductor.
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According to the 2005 NEC this would now be called an equipment bonding jumper.

raider1 said:
The equipment bonding jumper is used to connect the equipment on the line side of the secondary overcurrent device.



Chris
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This is now called the system bonding jumper if it goes from the transformer neutral to the metal frame of the first disconnecting means.
 
Trevor, I think we are thinking the same thing. Let me try to state my thoughts again.

The system bonding jumper is used to connect the equipment grounding conductors of the separately derived system to the grounded conductor. This can be done either at the transformer or at the first disconnecting means.

The equipment bonding jumper would be the bonding jumper that would connect the source of the separately derived system to the fist disconnecting means.

Chris
 
raider1 said:
Trevor, I think we are thinking the same thing. Let me try to state my thoughts again.

The system bonding jumper is used to connect the equipment grounding conductors of the separately derived system to the grounded conductor. This can be done either at the transformer or at the first disconnecting means.
Chris
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The name changes if you're bonding the neutral at the transformer or at the disconnect. They aren't called the same thing. The NECH has a good illustration of this on page 199 if you happen to have it.
 
Here is the comentary from the 2005 NECH for section 250.30(A)(1)

Where a separately derived system provides a grounded conductor, a system bonding jumper must be installed to connect the equipment grounding conductors to the grounded conductor. Equipment grounding conductors are connected to the grounding electrode system by the grounding electrode conductor. The system bonding jumper is sized according to 250.28(D) and may be located at any point between the source terminals (transformer, generator, etc.) and the first disconnecting means or overcurrent device. See the commentary following 250.28(D) for further information on sizing the system bonding jumper.
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The comentary states that the system bonding jumper can be located at any point between the source terminals and the first disconnecting means.

250.30(A)(2) doesn't have comentary from the NECH. But if you read this section, an equipment bonding jumper is a bonding jumper that is run with the derived phase conductors from the source of the separately derived system to the first disconnecting means. The purpose of this bonding jumper is to bond equipment on the line side of the first disconnecting means and overcurrent device of the secondary side of the separately derived system. This is similar to a bonding jumper that would be used to bond equipment on the line side of a service.

Chris
 
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