Clarification of Code Article

[pattbaa]

I'm confused by the wording of Art 250.66 (A), Connections to Rod/Pipe/Plate Electrodes.

The wording that I seek clarification on is in emphasis.

"Where the GEC is connected to( rod/pipe/plate) electrodes THAT PORTION OF THE (Grounding Electode) CONDUCTOR that is the sole (only?) connection to the electrode(is not required) to be larger than #6."

If a rod/pipe/plate electrode is installed as a "Supplementary" electrode, a #6 Bonding-Jumper connection between the electrode and a larger GEC that connects to the "Primary" Grounding-Electrode would seem to be the most practical type of conection.

 

[hbiss]

Re: Clarification of Code Article

If your "primary" and "secondary" grounding electrodes are any of the three (Rod/Pipe/Plate Electrode) then you only need to use #6 to connect to them. This assumes that this conductor ONLY connects to the electrodes and doesn't LOOP also to the cold water ground. Reason being that rod/pipe/plate electrodes are not meant to clear a fault condition and the resistance to ground will limit the current to well within the capacity of #6 regardless of the service size.

-Hal

 

[charlie]

Re: Clarification of Code Article

I am not sure if I understand what you are asking.

If you are asking about a bonding jumper from a rod or pipe electrode to the building steel, the water piping system where it enters the building, or to another grounding electrode or grounding electrode conductor then a #6 Cu. is all that is required. If this bonding jumper goes from one of the previous grounding electrodes or grounding electrode conductors to the rod or pipe electrodes and then continues on to another grounding electrode then the bonding jumper is sized according to table 250.66.

 

[pattbaa]

Re: Clarification of Code Article

I submit that the reference to "That PORTION of the CONDUCTOR" is mis-leading.A "portion" is defined as "part of a whole"--- is the "whole" referred to the conductor by itself?

Better clarity would be achieved if the Art read----" A Gounding Conductor which is a PORTION of the Grounding Electrode SYSTEM between the Grounding Electrode Conductor and rod/plate electrodes shall not be rquired to be larger than #6copper"

Thanks to All----

 

[pierre]

Re: Clarification of Code Article

'Supplementary' (250.54) grounding electrodes do not have to comply with the same requirements as 'Supplemental' - 250.53(D)(2).

Pierre