bkludecke
Senior Member
- Location
- Big Bear Lake, CA
- Occupation
- Retired Electrical Contractor
I am sending in a proposal to delete all of 250.56 which is the whole 25 ohms or less or else drive the 2nd rod.
Substantiation:
"Our research has failed to turn up any substatiation for this requirement. There is no stated method for determining ground resistance or whether the testing needs to be by a 3rd party. In most soils the ground resistance changes with the seasons and moisture content of the soil. No other types of grounding electrodes are subject to this requirement (ie. concrete encased electrode or 10' of 1/2" buried metal water pipe), nor is this requirement of less than 25 ohms resistance applied to multiple electrodes which seems to imply that the requirement is unneccesary to begin with."
I'm sure this has been proposed in the past many times and I'm sure that the proposal will be DOA but I'd at least like to know what the code panel's reasoning is on this subject.
Substantiation:
"Our research has failed to turn up any substatiation for this requirement. There is no stated method for determining ground resistance or whether the testing needs to be by a 3rd party. In most soils the ground resistance changes with the seasons and moisture content of the soil. No other types of grounding electrodes are subject to this requirement (ie. concrete encased electrode or 10' of 1/2" buried metal water pipe), nor is this requirement of less than 25 ohms resistance applied to multiple electrodes which seems to imply that the requirement is unneccesary to begin with."
I'm sure this has been proposed in the past many times and I'm sure that the proposal will be DOA but I'd at least like to know what the code panel's reasoning is on this subject.