Has this table changed between 2002-2005? I've been using Stallcup's Master study guide and a question has me stumped. Here is the question "Rigid metal conduit should be buried in the ground at a minimum of __ inches?"

A)4 B)6 C)12 D)18

I am coming up with an answer different than what the study guide says I should get using this table. I am using a 2002 code book,but a 2005 study guide.

Thanks

Nathan

6"?

my answer was 4" so is the 2005 table different than the 2002 table?

ngoody 24

Table 300.5 is the same (2002 & 2005) in Column 2 (RMC & IMC).

All locations not specified below...6".

Dave

That's one of the nice things about using rigid - not having to dig as deep!

The 6" cover requirement was first called out in the '71 or '75 NEC, and hasn't changed since.

The fine print of the code aside, I like things DEEP. For me, this means a minimum of being a coupl incehs deeper than the bottom of a slab, and deeper than the blade of a shovel (about 12").

Why? Because I don't want the pipe hit every time the gardner plants a flower or fixes a leaky irrigation pipe. I don't want the slab to act like "the worlds' dullest scissors" where the pipe exits. And I don't want the pipe cut when the plumber has to open up the slab to replace a drain.

Good point about the plumber. Rigid is tough stuff but no match for a 14" chop saw.