Permanent Moisture Level
Permanent Moisture Level
(OP)
Hello,
I'm not a PE - I'm involved in the electrical trade. But I'm hoping that a civil engineer can point me in the right direction. There is a code in the National Electrical Code [2014 NEC Article 250.53(A)(1)] that references "permanent moisture level." It reads like this,
"If practicable, rod, pipe, and plate electrodes shall be embedded below permanent moisture level."
My Questions:
1. Is there such a thing as "permanent moisture level?" If so, would it not change due to rainfall, lack thereof, etc.?
2. What document or standard do I go to in order to learn more about permanent moisture level and where to look up the various depths of permanent moisture level for any given area? Or does this depth require some kind of a soil study for that particular piece of property?
3. Can permanent moisture level vary from area to area, or even lot to lot?
Thank you for any help, or if you can at least point me in the right direction.
I'm not a PE - I'm involved in the electrical trade. But I'm hoping that a civil engineer can point me in the right direction. There is a code in the National Electrical Code [2014 NEC Article 250.53(A)(1)] that references "permanent moisture level." It reads like this,
"If practicable, rod, pipe, and plate electrodes shall be embedded below permanent moisture level."
My Questions:
1. Is there such a thing as "permanent moisture level?" If so, would it not change due to rainfall, lack thereof, etc.?
2. What document or standard do I go to in order to learn more about permanent moisture level and where to look up the various depths of permanent moisture level for any given area? Or does this depth require some kind of a soil study for that particular piece of property?
3. Can permanent moisture level vary from area to area, or even lot to lot?
Thank you for any help, or if you can at least point me in the right direction.
RE: Permanent Moisture Level
RE: Permanent Moisture Level
So I'm questioning the validity of that code entirely. I would welcome any further comments.
RE: Permanent Moisture Level
f-d
ípapß gordo ainÆt no madre flaca!
RE: Permanent Moisture Level
For example, I have a service upgrade that I must do on Hilton Head Island, SC. Where do I go to ask - or what reference manual to I go to, in order to find out how far down my ground rod must be (per NEC)?
Please don't tell me to go to the local building department. They don't have any idea what the "permanent moisture level" is.
Please help me find the unicorn. What do I do?