Hello, I recently had a 60A dual pole breaker, located in my main panel, trip. This breaker fed a subpanel in my guesthouse. In troubleshooting the problem we tracked it down to a short in a splice box near the main panel, which we cleaned and reattached with wirenuts and rubberized tape, for now. We also found a second short where the copper 6/0 cable enters the main panel. One of the hot leads shorted against the bulkhead where the conduit enters the box. Also, temporarily insulated this wire.
The splice box was installed by the PO and houses a splice of 2/0(or 4/0?) Aluminum service feed from the guesthouse to a short 6/0 copper feed to the 60A dual pole in the main panel. I am not sure why the splice was done.
Nonetheless, I want to install a new weather tight junction box, rework the splice within this box and replace the 6/0 copper wire with damaged insulation.
Is it ok to keep this splice in the service feed to the guesthouse subpanel? Or should it be all one run of cable from the weather-head to the main panel?
If a splice is okay, what would you recommend in terms of a weather tight box and connectors other than the wirenuts? Is there an aluminum paste that should be used on the Al service cable to prevent corrosion? Lastly, what sort of insulation tape should I use around the new splices?
Get Help from Bob Vila
- Give-Aways & Offers
- Monthly Must Do's
- DIY Project Ideas
- Step-by-Step Guides
- Inspirational Photo Galleries