richwaskowitz
Senior Member
- Location
- Shelby Twp. MI, near Detroit
When fuse coordination (black-out prevention) is required between a control panel and its bus plug, even when putting FRS fuses in the plug and Js in the panel disconnect, the fuse in the bus plug should be 1.5 times the setting of the one in the panel. Does that mean that the feeder conductors need to be sized to the bus plug fuse or can they be sized for the load? For example: A panel with a 80 amp load might have a LPJ100 fuse in the main disconnect to allow for future expansion. If an FRS150 fuse is put in the bus plug, do the feeders need to go to 1/0?