"DoN. Nichols" wrote in message
...

Is that genuine Variac (General Radio) or a Superior Electric
Powerstat, or some other brand? It may be that some models have the
insulated shaft and others the insulated hubs within each brand.

Enjoy,
DoN.

My General Radio type W20 Variac, 20A @ 120/140V, has an insulated
steel-core shaft.