I think that you might be wrong regarding a second or casting vote. The “or” is used disjunctively. My understanding is that a Chairman can exercise a first vote, and then where there is an equality of votes he can cast a second vote which has the effect of breaking the tie. The “or casting vote” means that where a Chairman has not cast a first vote, and there is an equality of votes, he has the power to break the tie by using his casting vote. In these circumstances it is not a “second” vote but a “casting” vote.

I work in Local Government and this is how we operate it, but I’d be interested to have your views.

Regards