250 53 ques?

[wireman1]

250 53 g states if you cannot drive the ground at a 45 degree angle they can be buried in a trench that is at least 30 in . deep. what if you only can reach a dept of 22 in because of solid rock can you incase the ground rods in cement that is at least 2 in thick as stated by table 300.50 note 2

 

[petersonra]

250 53 g states if you cannot drive the ground at a 45 degree angle they can be buried in a trench that is at least 30 in . deep. what if you only can reach a dept of 22 in because of solid rock can you incase the ground rods in cement that is at least 2 in thick as stated by table 300.50 note 2

2. Where solid rock prevents compliance with the cover depths specified in this table, the wiring shall be installed in a metal or nonmetallic raceway permitted for direct burial. The raceways shall be covered by a minimum of 50 mm (2 in.) of concrete extending down to rock.

I don't see how the note applies to anything not a conductor. A ground rod is not a conductor.

There is never a requirement that you install a ground rod. That is just one of the grounding electrodes that is allowed. IMO, if you cannot install a legal ground rod, you would need to use one of the other allowed grounding electrodes.

However, I would point out that adding 8 inches of cover over the area of the buried ground rods might be an answer.

 

[infinity]

250 53 g states if you cannot drive the ground at a 45 degree angle they can be buried in a trench that is at least 30 in . deep. what if you only can reach a dept of 22 in because of solid rock can you incase the ground rods in cement that is at least 2 in thick as stated by table 300.50 note 2

If buried horizontally you have to meet the 30" depth requirement for it to qualify as an electrode.

(G) Rod and Pipe Electrodes. The electrode shall be in-
stalled such that at least 2.44 m (8 ft) of length is in contact
with the soil. It shall be driven to a depth of not less than
2.44 m (8 ft) except that, where rock bottom is encoun-
tered, the electrode shall be driven at an oblique angle not
to exceed 45 degrees from the vertical or, where rock bottom
is encountered at an angle up to 45 degrees, the electrode shall
be permitted to be buried in a trench that is at least 750 mm
(30 in.) deep. The upper end of the electrode shall be flush
with or below ground level unless the aboveground end and
the grounding electrode conductor attachment are protected
against physical damage as specified in 250.10.

 

[MasterTheNEC]

250 53 g states if you cannot drive the ground at a 45 degree angle they can be buried in a trench that is at least 30 in . deep. what if you only can reach a dept of 22 in because of solid rock can you incase the ground rods in cement that is at least 2 in thick as stated by table 300.50 note 2

Simple question...if it can't comply you can't use it as an option.