It is my understanding that under NEC requirements you must use shielded cable when running above 2400V. Someone also told me that if you have a transformer that has a voltage tap above 2400V you must use shielded cable whether or not you are using the tap or not. For example if I have a...
I'm trying to design a junction box and I am having difficulty interpreting NEC 314.71 for the sizing requirements. I have a straight pull through the junction box and it states that the length of the box needs to be 48 times the outside diameter, over sheath, of the largest shielded conductor...
