I don't know what a Marr type connector is. I have seen alarm installers use "beanies" or "Good and Plenty". These are the old telecom crimp connectors that the telecom industry has replaced with Scotch Locks.
Wire nuts? Never. Also I didn't mean to imply that Scotch Locks were the same as the "beanies" or "Good and Plenty" type connectors. These originally were used in telecom but have caused problems and have been replaced by Scotch Locks.
Alarm guys still use the "beanies" or "Good and Plenty" connectors because if you strip the wires you can use them with solid, stranded or combinations of both. This is something you can't do with Scotch Locks which is why you won't see alarm guys use them.
Just as popular as I said is soldering and insulating with tape because if reliability.
[This message has been edited by hbiss (edited 03-23-2005).]
We try to NEVER terminate wires except at the devices, this can only be done on new installs.when adding 1 or 2 devices we sometimes have to use wirenuts but we tape the joint with Scotch 33+. I have found most fire alarm specs call for terminal strips only for any temination
dstanford has a good point. I haven't seen an alarm company for a long time rough a building leaving tails in the basement. Pretty lazy if you ask me. Why not just complete the runs to the panel location? All those splice which will eventually be buried are potential trouble spots and is why wire nuts would never be used, especially with small gauge wire.
[This message has been edited by hbiss (edited 03-28-2005).]
We appreciate your comments Sponge, but different thoughts are appreciated. As an installer, we come across different situations. The purpose of the forum is to exchange information in the interest of doing a proper or better installation. In our field, many licensed electricians, including us, regularly install alarm systems, along with fire alarms, central vacs, cable tv, telephone, and data cables. True, it may not all be rocket science, but tips are always appreciated. Cheers!