Posted by buickanddeere on August 25, 2017 at 15:23:40 from (216.183.151.83):
In Reply to: Adding Power (OT) posted by KEB In GCMS on August 24, 2017 at 14:47:52:
Quoting Removed, click Modern View to see
Either that electrician is incorrect OR there was a misunderstanding. There could be confusion regarding the nasty old overhead triplex distribution system .Which is a legacy problem from back in the bad old days of early electrical systems and when grounding systems were introduced for farm and residential use .
The underground supply to the shed will use a bare or green ground , an insulated white neutral and Line 1 with the option of line 2 on single phase . Line 1 with the option of line 2 and the option of line 3 with the a three phase wye system.
The breaker panel in the shed will have at least one ground rod or ground plate tied to both the breaker panel ground bar and to the ground wire in the supply conduit .
The shed breaker panel neutral bar will float electrically isolated from the ground bar/ground system. This way voltage drop on the neutral does not force neutral load current through the ground system .
If neutral current travels through the ground system, the ground system becomes energized to a potential above earth potential. This is how "tingle voltage" occurs which causes livestock to suffer electrical shocks while drinking , eating at metal feeders or while being milked .
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