doingmybest
Member
- Location
- Virginia
I have a control cabinet that is fed with a 480 3PH 100A feeder to a 100A breaker inside of a main control cabinet. There are two sections to this cabinet. It has been decided that the two cabinets need to be seperated by about four feet. On the load side of the main breaker for the cabinet, they have multitap lugs that you can tap off of and route conductors to various breakers inside the enclosures. Because the second cabinet has a set of breakers in it, we will need to feed these from the main cabinet. The company that designed the equipment made a drawing to just tap off of the load side of the main and route the cables outside the cabinet to the seciond enclosure and terminate the wires on these breakers. They are using a #8 AWG CU wire and the distance is less than 25 feet. Upon looking at NFPA 79 Article 7.2.8, I feel that the #8 conductors need to be protected where they receive their supply at because all of the criteria of 7.2.8 (1)(d) has not been met. Should a OCPD be placed on these conductors? I feel that it is not safe due to the fact that the only short circuit protection they will have is the 100A main breaker in the main enclosure. Can someone please clarify or point me to the article in either NFPA 79 or NFPA 70 that will anwer the questions? NFPA 70 covers the installation from the electrical panel to the equipment and NFPA 79 covers everything beyond the main disconnecting means of the equipment correct?
