Extending alarm cable

[Jupiter01]

I have a texecom alarm and one of the devices on this system is an outdoor door contact. I am re situating this door and hence, need a longer cable. It is not possible to feed a new one. Is there a reliable way to extend these cables? What method should I be using?

Thanks in advance.

 

[T1GERIII]

Alarm junction box

 

[Jupiter01]

Are Jelly Crimps suitable for this? I can situate them in a IP65 box.

 

[farmo]

An alarm junction box (inside the house or ip box), with a tamper connection is the correct way, but you can use whatever you like, jellies, bullets etc. in a ip65 box as it should stay dry, providing you use glands and bottom entry the cables.