T stands for tube or loam(???), are those holes big enough to get two K and T wires in one hole with the tube. As you know you cannot separate the wires ie one per hole because of inductive heating. just my 2 cents.
Loc: Bucks County PA
K&T wiring normally is separated throughout the system and it enters boxes via 2 separate holes. I'm not sure that there is enough separation of the wires in small wall cases to cause inductive heating problems, which is also of course related to the amount of current flowing.
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