shortcircuit2
Senior Member
- Location
- South of Bawstin
Can I use the equipment grounding conductor in the SER feeder cable to a subpanel as the grounding electrode conductor for the connection to grounding electrodes under this new exception?
Can you install it in a manner where all of the installation requirements for a grounding electrode conductor are met? Also why does a sub-panel need a grounding electrode conductor connection?Can I use the equipment grounding conductor in the SER feeder cable to a subpanel as the grounding electrode conductor for the connection to grounding electrodes under this new exception?
I like the exception too, but you wouldn't need an exception if you didn't have the rule, so why not just get rid of the rule and save some ink.I like this exception and feel CMP 5 made a good decision reversing the prohibition in the 2011 edition. This option can save the installer a lot of time, materials, and money. There really is no safety or sound technical reason to not permit a conductor like an EGC to serve more than one purpose. The grounded (neutral) service conductor serves at least three purposes all at the same time. So why not double up an EGC as a GEC...
Can you install it in a manner where all of the installation requirements for a grounding electrode conductor are met? Also why does a sub-panel need a grounding electrode conductor connection?
sizing is critical & a SER feeder EGC is usually sized to the OCPD not the service entrance conductors Cir Mil for a sub panel
I like the exception too, but you wouldn't need an exception if you didn't have the rule, so why not just get rid of the rule and save some ink.
Having it written does add clarity - protection from those who don't understand that the code is permissive.
What leads you to believe the NEC is intended to be a permissive code when not otherwise explicitly stated in a "shall be permitted" type format?
Because that is the way it is.
It would not work any other way.
So you believe that anything and everything is permitted unless the code specifically prohibits it?
Sure. The NEC has many provisions for minimum compliance. But what if someone wants to exceed the minimum requirement with non-conforming practices?
What code section would you cite if I installed a 15 amp branch circuit in addition to the 20 amp one I already installed in the laundry area?
If the NEC does not prohibit it I can do it
It doesn't matter. The code says what it says. The code is permissive. It tells what we must do and what we can't do, it doesn't tell us everything to do.Do you believe that CMP 2 would agree with that, citing this specific example?
If they don't then they can write a new rule....
Do you believe that CMP 2 would agree with that, citing this specific example?