Protection Modules

[31LDog]

We have a customer that has a Magix system but they are using older MLX style phones. It is a multi bldg. environment in need of proper lightning protection for IROB extensions. I have a full understanding of proper protection (primary and secondary) and grounding but need ideas on modules. I do not want to use Panamax DS2 protectors because I would have to fill up the wall in order to accomodate all out of bldg. extensions. These modules properly protect MLX sets w/ a clamping voltage of 70V on pins 3&6 and 110V on 4&5 (if I remember correctly). I would like to use the larger DS25 module and cut the equip. and line side down on 66 or 110 but this module provides protection with a clamping voltage of 110V on all prs. Is this adequate protection for MLX sets. I don't want to do pr. by pr. protection because they have several analog or single sets out of bldg as well and don't want a tech. mixing up prot. modules. Sorry for the full page letter, I guess I hang out with too many salesman and don't know when to shut up. Any input is appreciated.
Wes

 

[jinxs]

Well Wes,

I have already used the "bridging clip" type protection for ATL sets(what the DS2 would cover by using only path 1) and they seemed to work fine. They use the 300ma fuses times four(two for each conductor). Now you might ask for a part number and my answer to that is I am at home and have no clue. Basically you would cut down 2 25prs on a split 66M. The one 25pr would go to your primary and the other would go to the cross connect field. Then the protection would go between the two on the 66 like a bridging clip. Then there is a ground bar that goes along the side of each protector to ground them. Good luck.

 

[ttech]

Do a google search for "edco protector" the H series is what you need they have a 75- 85 Volt break that will auto reset
-Don

 

[31LDog]

Thanks for the input. I have also used the bridging type protectors you mention but the only specs I see on Panamax/ITW Linx protectors go from low clamping voltages, to 70/75V then jump to 260V for primary and secondary. My concern is the the T/R on an MLX set and proper protection. From what I've read these sets produce atleast 90V for ringing which would trip ring on a 70V prot. but, would standard 260V prot. modules properly protect these sets and ports. If using the DS25 like I mentioned would it provide proper protection for pins 3&6 with 110V clamping voltage. They currently only have primary protection with I guess 20 sets or so out of bldg. so I guess any other solution is better.
Wes