Originally Posted By: Dave Derie
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new to the board. I've been an electrician for 18 years, from what's described its pretty vague to give a definite opinion. Its something a qualified electrician should investigate.
double tapping and double lugging are pretty much a no no in most applications and manufactures specs. Square D allows double tapping on their breakers for surge protectors and similar applications. Not for adding more items to a circuit.
I am the first to say that I am not a expert or have all the knowledge or every manufactures specs. It should state what is allowed for that particular application in side the panel. If its not stated to allow double lugging or tapping on the specs then its wrong according to code. In my experience the manufactures specs superceed the code though with most Jurisdictions.
Most manufactures allow it for grounds only. Never current carrying conductors I.E. hots and neutrals
On the post of sharing a neutral on multiwire circuits. Each hot MUST be on a separate phase. If not then you will have a unbalanced load on the neutral and have the potential to overload it. Typically a 3 wire is used for this type of installation and will have a red and black wire. Be watchful of Twin breakers since they share the same phase. This is where is usually run into a phasing problem.
Just want to say that I have done most my work in the west. California and Nevada so I am only use to how its done around here. So what I say may not be how its done in other parts of the country.