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I'm installing a new supply to a ceremoniously dumped welfare cabin. I can't see any legitimate reason not to apply section 717, welfare units are specifically mentioned and the thing is a mobile/transportable unit. In turn this dictates that it shouldn't be connected to a TN earth as to my thinking at least none of the exceptions apply. Any arguments countering this are welcome!
So my current plan is TN up to a box near it, then become TT.
My question is about possibly using earth tape (I've never used it). As there's a nice 2.5ft deep 10ft long trench in preparation for a drain I thought it might make sense to use earth tape instead of banging rod(s) in.
I believe that I've calculated that 3m of tape, 0.75m down, with soil resistivity at an arbitrary worst case 150ohm-meters should give me 35 ohms impedance. As I can see clay I think this is a reasonable worst case guess.
Any superior wisdom welcomed, I'm really seeking confirmation that it's likely I can get a better result far more easily with tape in this case.
So my current plan is TN up to a box near it, then become TT.
My question is about possibly using earth tape (I've never used it). As there's a nice 2.5ft deep 10ft long trench in preparation for a drain I thought it might make sense to use earth tape instead of banging rod(s) in.
I believe that I've calculated that 3m of tape, 0.75m down, with soil resistivity at an arbitrary worst case 150ohm-meters should give me 35 ohms impedance. As I can see clay I think this is a reasonable worst case guess.
Any superior wisdom welcomed, I'm really seeking confirmation that it's likely I can get a better result far more easily with tape in this case.