Secondary conductors can be protected by the Primary overcurrent device if it is a two wire secondary or a single voltage Delta/Delta xformer. 240.21(C)(1)
Protection of the secondary of the xformer is optional. Good engineering IMHO would have the secondary of the xformer protected. Protection of the conductors taping the secondary or supplying the xformer is not optional. It is quite common to confuse protecting the xformer with protecting the wires connected to it.
Last edited by George Little; 04/07/07 03:16 PM.
