Originally Posted by oldtimer1955
Thanks for the reply.
I have managed to expose the cable run now and it says:
AWG 8 - 3 WITH 10 GROUND TYPE NMB-600V
Soo - that's four wire - right?
Yes that is a four wire circuit. You can extend it using the large blue or grey wire nuts, small split bolt connectors, or patent connectors such as the Polaris brand. The Polaris connectors are a good choice for your application because they are more easily applied by inexperienced persons and the needed insulation is already built in. They can be purchased at any electrical supply house.
Remember to keep the junction box accessible.
Be sure to bond the box to the bare equipment grounding conductor if it is a metal box.