Splicing wire for generator hookup

[Borgia]

Im planning on setting up and interlock generator hookup up. My portable generator is 30 amps. I ran 25 ft of 10/2 wire from my panel to the outside. Lets just say this wire run was really difficult and its not easy to run a longer replacement wire. Anyways the 10/2 wire is about 10 feet to short. Can I just use a box and splice an additional 10 feet of wire to get the generator hookup where I need it? Or is this not advisable since a generator will be running on it?

 

[James]

In short, yes it can be joined.
should be in a box with adequate connections .

 

[Borgia]

Ok and wire nuts will be a good enough connector?

 

[James]

I think they are considered good enough in the us.
@Megawatt is based your side of the pond and should be able to confirm.

 

[pc1966]

It is not just the joining of the conductors using wirenut or something else, you also need some junction box that will provide mechanical support for the cables (so the joints are not flexed as any cables move) as well as preventing water or fingers getting to the joints.

Typically in the UK we might use something like the Whiska 407 box (which comes with some leaver-action Wago joints, though I don't think they would take #10AWG cable as that is almost 6mm^2):

Wiska 10109674 Junction Boxes

Buy Wiska 10109674 Junction Boxes online at Shop4 Electrical & get FREE Next Day UK Delivery when you order by 2pm & spend £60

www.discount-electrical.co.uk

Along with a couple of IP68 rated plastic glands to clamp the cables:

Wiska 10100613 Cable Glands

Buy Wiska 10100613 Cable Glands online at Shop4 Electrical & get FREE Next Day UK Delivery when you order by 2pm & spend £60

www.discount-electrical.co.uk

If your joint is indoors (so no need for any IP style of water resistance) then you can get complete junction boxes like these with screw terminals and cable clamps built in:

60A Junction Box 3 Terminal White

A selected range of special purpose moulded and stainless steel accessories

www.cef.co.uk

However, @Megawatt is likely to know what sort of enclosures are available and suitable in the USA.

 

[Megawatt]

Im planning on setting up and interlock generator hookup up. My portable generator is 30 amps. I ran 25 ft of 10/2 wire from my panel to the outside. Lets just say this wire run was really difficult and its not easy to run a longer replacement wire. Anyways the 10/2 wire is about 10 feet to short. Can I just use a box and splice an additional 10 feet of wire to get the generator hookup where I need it? Or is this not advisable since a generator will be running on it?

Yes you can splice your wires and you have 2 choices. Use a box which cannot be under ground because it has to be accessible. The second choice is what I have done in the past is Home Depot and Lowe’s sell underground splice kits. Make sure you have a heat gun to shrink the rubber tubing after you make your splice.