Grounding 2000IPS

[wayne50]

I would like to know the proper grounding of the field wiring coming into a 2000IPS. We have four buildings , one has a 2000IPS feed from building two ( voice and T-1 ) Hub site. Building three and four are feed from building two ( voice only , no 2000ips switch ). At all four sites the field wiring is grounded from 66 block surge protector. I think this is where I am having trouble loosing cards during thunderstorms ( cp-15 and cp-24's ) ,any help or ideas will be appreciated.

 

[donporter]

• Communication grounding: Less than 10 ?
• Protective ground for PIM : Less than 10 ?
NOTE: The AC ripple on these various grounds should be less than 1/2 Vp-p.

I don't think this will help much. Do you have the battery on all the PIM?

 

[MercuryComm]

You may want to check out this link to a company that has a page of info on grounding and the parts to do it.

http://www.sandman.com/surge.html

Our company has used these products for the same type situation you are in and have had no issues with lightning once we installed them. Be sure you order the correct protector for each type device you are trying to protect.

Good Luck!!

 

[wayne50]

Thanks for the advice. One other thing , where do you ground the cable sheath ground at ? Do you ground both ends even if it goes to another building 1000 ft away ? Thanks.

 

[smoom]

If memory serves me right....if the burial or aerial cables extend more than 50' beyond one building before entering another you are required the bond the sheath at each end, and install lightning protectors labeled for primary protection on each end. Not sure if the Electrical code has changed since I read that a long time ago. I have always used either porta systems or realtek lightning protectors for the primary then used Panamax/ITW Linx for a secondary protection.

 

[wayne50]

Thanks smoom , but is that to power ground or ground rod if their is one ? , or maybe the building frame , thanks.

 

[smoom]

National electrical in the US required at one time that all communications devices had to be bonded to the electrical system ground. The building frame along with any water pipes are supposed to be bonded to the same electrical ground. They say it was to reduce the issues of having one system grounded better than another, if all are tied together then all sources should have the same potential to ground.

 

[MercuryComm]

Try this link to a PDF that somewhat explains grounding and where to ground.

http://www.polyphaser.com/NR/rdonlyres/C1565001-F81A-4AC2-A98F-E88B8037F988/192/TD1026.pdf