Does the minimum-size (1/0) requirment of Art 310.4, Conductors in Parallel, apply to Equiptment Bonding Jumpers connected on the Supply-Side of the Service Dis-Connect(s)?
Art 251.102, Equiptment Bonding Jumpers, (C),Size-Equiptment Bonding Jumpers on the Supply-Side of the Service. reads---- "When the Service Entrance Conductors are parallel in 2 or more Raceways----the size of the Bonding Jumper for each Raceway shall be based on the size of the Service Entrance Conductor in the Raceway."
On the basis of this Art., the size of the Bonding Jumper is determined by referring to Table 250.66
Art 310.4 refers to Equiptment Grounding Conductors for installations with circuit-conductors connected in parallel.The size of this specifc type of Equiptment Grounding Conductor is determined by referring to Table 250.122
I pose this question because in the book "Electrical Grounding" the author, Ronald O'Riley, presents an "example" of parallel Service Conductors arranged in two 350mcm/ per-phase in 2 raceways.
Table 250.66 lists a #2 Bonding Jumper for each raceway, based on a 350MCM conductor,but O'Riley refers to the 1/0 minimum requirement of Art 310.4 and rejects the #2 conductor, and the "example" shows a 1/0 Equiptment Bonding
Jumper.
As best I know, the only reference in Art 310.4 to a specifc type of non-circuit conductor is to an Equiptment Grounding Conductor, as distinguished from a Equiptment Bonding Jumper.
With appreciation, Proud And Thankful----
Art 251.102, Equiptment Bonding Jumpers, (C),Size-Equiptment Bonding Jumpers on the Supply-Side of the Service. reads---- "When the Service Entrance Conductors are parallel in 2 or more Raceways----the size of the Bonding Jumper for each Raceway shall be based on the size of the Service Entrance Conductor in the Raceway."
On the basis of this Art., the size of the Bonding Jumper is determined by referring to Table 250.66
Art 310.4 refers to Equiptment Grounding Conductors for installations with circuit-conductors connected in parallel.The size of this specifc type of Equiptment Grounding Conductor is determined by referring to Table 250.122
I pose this question because in the book "Electrical Grounding" the author, Ronald O'Riley, presents an "example" of parallel Service Conductors arranged in two 350mcm/ per-phase in 2 raceways.
Table 250.66 lists a #2 Bonding Jumper for each raceway, based on a 350MCM conductor,but O'Riley refers to the 1/0 minimum requirement of Art 310.4 and rejects the #2 conductor, and the "example" shows a 1/0 Equiptment Bonding
Jumper.
As best I know, the only reference in Art 310.4 to a specifc type of non-circuit conductor is to an Equiptment Grounding Conductor, as distinguished from a Equiptment Bonding Jumper.
With appreciation, Proud And Thankful----