The main ground should not have a splice to ensure continuity of the ground. The reality is that this is done in some cases. If the splice should loosen or be intermittent you will create a shock hazard.
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rat tail splice western union splice
It is the same type as the western union splice, where the two wires are overlapping and wound back on the opposite conductor.
A wire splice is the joining of two or more wires together. Commonly this is done with an approved wire joining nut. All slices are to be made in junction boxes to prevent fire should the wire splice become unserviceable.
250 mcm
In the US, the common usage of these colors is: BLACK: Hot - connected to one phase of the service AC. WHITE: Connected to the Neutral of the service AC. GREEN: Connected to the GROUND bus at the service entrance. At the service entrance, the GROUND and the NEUTRAL bus are connected together.