Additional grounding of KSU cabinets?

[telemarksman]

Ladies and Gentleman, especially certified electricians:
Due to many KSU power supplies failing, I believe in addition to the grounding prong of the KSU power cord that we should also be installing a direct ground wire to the cabinet.
I would appreciate all EXPERT opinions on this.
Thank you.

alwayslearning

 

[jrgood0852]

Absolutely can't go wrong. Make sure it is indeed the buss bar that the electricians installed. In my oppinion, great practice. Let's see what others come back with. This should be good...................

Always look out for the next tech. because one day it will be you!

 

[telemarksman]

Ground potential is a major concern. I just had two IP office telephone sets go down after a storm.
Note: Almost everything is now made in CHINA.
The Chinese make mistakes in their electrical engineering designs
e.g. back up power supplies.

alwayslearning

 

[Dexman]

To avoid ground potential problems....if chasis grounding is desired....ground to the same outlet that supplies power to the system.

I "FEATURE 00"

http://mysite.verizon.net/vze7n25t/

 

[mforrence]

Ditto what Dexman says - it's ALL about having the best path to ground NOT be thru your equipment! Bonded grounds or use the same ground.

 

[jrgood0852]

A good lightning storm will let you know how important grounding is!

Always look out for the next tech. because one day it will be you!

 

[2600hz]

Hi telemarksman,

I agree with everyone here. If I'm not mistaken, most tel/KSU systems have a dedicated bolt/connection point for earthing. There are times when some questions arise, such as if the unit should be connected to the rack it's mounted to (which is bonded to earth) or have its own bond... that will depend on the circumstances. As long as the connections are all going to the same place (earth) - that's the important bit.

In addition, you have the option to install hard-wired surge suppressors specifically manufactured for lightning, etc... these are DIN-mounted heavy duty (sometimes expensive) circuit-dedicated devices which will add a layer of protection. There's some info here:

http://www.nhp.com.au/files/editor_upload/File/Brochures/Power-Distribution-and-Protection/NCIRC.pdf

Cheers

 

[jrgood0852]

That's right, 2600. If done properly, all racks/cabinets will have the proper grounding. Obviosly the paint has to be removed at grounding points. So, using the rack/cabinet ground you normally cannot go wring. If going to the frame (wall, etc.) then obviously go to the buss bar. If there isn't one I'd bring that to the attention of the onsite folks and tell them you need one installed. Thanks.

Always look out for the next tech. because one day it will be you!

 

[curlycord]

If it has a 3 prong then usually no need for additional grounding.
Seeing if there is obvious ground terminals or reading the manual will state if required.

It's is always best to have a dedicated isolated ground receptacle for the telephone system.
You should always install a system with a UPS Battery/Surge protector.
You should not use any surge protection power bars on a USP, let the UPS do the protection.

What systems are you installing for you to have so many PS issues?
How old are these systems?







=----(((((((((()----=
curlycord

http://www.curlycord.com

Toronto Canada

http://www.telcopc.ca

 

[KE407122]

Curly Cord,

It may be related to Geography as well.

Old Async Switch Muxes/PACX routing hubs that worked flawlessly at Pearson,or anywhere between Wolfe Island and Windsor would routinely go Crispy-Critters 150 km north on the Canadian Shield. Key systems in the same area, the KSU cards would weld themselves to the backplane, regardless of protection.

My favorite was the old..."Ground to Street-side of Water Main, before the water meter." Unfortunately that didn't work well on the Ground I found strapped to a PLASTIC entrance pipe.

KE407122

"The phone was working fine before it knocked over my coffee.

 

[curlycord]

It may be related to Geography as well."

I was thinking that too.

telemarksman should post city of issues.



=----(((((((((()----=
curlycord

http://www.curlycord.com

Toronto Canada

http://www.telcopc.ca

 

[telemarksman]

I originally posted this because plenty of Partner proccessors, some Merlin KSU,s AT&T Spirit, Vodavi DHS, Vodavi STS, Panasonic KX-T etc. etc. seem to get hit by some type of surge, then go belly up. I thought this grounding redundancy may help alleviate such misfortune for the customer. I am in San Diego, CA
Sometimes after storms I get many Door King gate card problems that are connected to phone lines and I thought there could be a correlation.

alwayslearning

 

[KE407122]

I think it's your faults. Check out California Geological Survey mapping.
Tide can cause marked differences in Ground potentials.

See Earthquake Lightning.

http://www.bbc.com/news/science-environment-26462348

Most of that equipment you've listed I've serviced at one point or another but rarely, other than predictable geographic regions seen them damaged with regular protection measures.





KE407122

"The phone was working fine before it knocked over my coffee.