Lighting, Light Fixtures, Ceiling and Exhaust Fans - outdoor low voltage wiring

I bought a Malibu light kit to install on my deck posts. The kit comes with 50' of wire, but by the time I run 10' of wire before the first light, I won't have enough wire to go completely around the deck. Can I just splice on as much wire as I need, as long as it's the same gauge? What would be the correct type of splice? Or is it better to buy one length of wire that's long enough to do the whole job by itself? I looked on Malibu's website and they don't address this. I couldn't find anything in the archives here either.

Thanks for any advice.

You can splice it. Use wire nuts rated as being "waterproof" or "direct burial".

You can splice it. Use wire nuts rated as being "waterproof" or "direct burial".

It's usually convenient to do this at the connection point of the fixture nearest the end of the wire. That way when the splice goes bad you won't have to dig too far to find it.

Whenever you use wire nuts in wet locations, always orient the nuts with the open end facing the earth so water & condensation can drain.

Or use the UF rated silicone filled bcaps. Nice.

It's on deck posts. It's ugly but put the splice in a box.

Actually I just went ahead and got a 100' length of wire. I don't need to bother with splicing it now. I got about half of the railing/light install done yesterday. The hardest part was the first span. Figuring out how to run the wire through the railing and through the post, allowing for the wiring from the light itself, and a loop up to the top of the post, was the hardest part. Once I came up with a good system it went pretty smooth. I just bored a series of interconnecting holes to route the wires through. Unfortunately I ran out of daylight. I should get it finished today. I found if I make the vinyl post covers taller than the wood post by a bit, then I have plenty of room at the top for the extra wiring and connections. The post cap has room in it too, if I would need it. Now if only I could figure out a way of attaching the post caps so they would still be removable down the road if I should have to replace a light fixture. If I cement them on I don't think they will come off very easily.

Now if only I could figure out a way of attaching the post caps so they would still be removable down the road if I should have to replace a light fixture. If I cement them on I don't think they will come off very easily.

How about a thin bead of latex caulk? It can easily be sliced later with a drywall knife.

One of my neighbors suggested silicone caulk. One of the two will probably work.