telecommunciations ground bus
- Thread starter bwyllie
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charlie tuna
Senior Member
- Location
- Florida
Re: telecommunciations ground bus
the telephone ground bus is usually connected by a #6 ground wire back to the panel that the telephone equipment recieves it's power from, and connected to this panel's ground bus...
the telephone ground bus is usually connected by a #6 ground wire back to the panel that the telephone equipment recieves it's power from, and connected to this panel's ground bus...
al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
Re: telecommunciations ground bus
There's a lot of stuff in 800.40. This is only part of it.
There's a lot of stuff in 800.40. This is only part of it.
Re: telecommunciations ground bus
You are dealing with two requirements. One is the minimum NEC requirements for safety. The other is performance requirements adopted by the client using ANSI-J-STD-607-A, which meet and exceed NEC requirements.
[ January 10, 2005, 02:49 PM: Message edited by: dereckbc ]
Yes, if you are installing per ANSI standard J-STD-607-A, section 5.5
You are dealing with two requirements. One is the minimum NEC requirements for safety. The other is performance requirements adopted by the client using ANSI-J-STD-607-A, which meet and exceed NEC requirements.
[ January 10, 2005, 02:49 PM: Message edited by: dereckbc ]
Re: telecommunciations ground bus
I would like to install for the ANSI-J-STD-607-A requirements. However they are trying to VE certain items and this is one of them, the contractor has recommened just bonding each tele ground bus to the building steel within the rooms and I did not think that was what the standard is.
I would like to install for the ANSI-J-STD-607-A requirements. However they are trying to VE certain items and this is one of them, the contractor has recommened just bonding each tele ground bus to the building steel within the rooms and I did not think that was what the standard is.
Re: telecommunciations ground bus
By VE I assume you mean value engineered. If you are certain the building steel is effectively bonded together and bonded to the service ground, then it would work. The building steel exhibits a lower impedance point-to-point than any cable is capable of.
The point of ANSI 607-A is to offer multiple planned and unplanned paths. The cable is a planned path, where as building steel, pipes, raceways are uncertain.
By VE I assume you mean value engineered. If you are certain the building steel is effectively bonded together and bonded to the service ground, then it would work. The building steel exhibits a lower impedance point-to-point than any cable is capable of.
The point of ANSI 607-A is to offer multiple planned and unplanned paths. The cable is a planned path, where as building steel, pipes, raceways are uncertain.
marionette
New member
Re: telecommunciations ground bus
I can be corrected, but the NEC requirements for grounding are to an approved ground (the electrical grounding system). The secondary grounding can be made to the steel, pipes, etc.
By VE'ing the grounding to the electrical system, you could be violating the NEC.
The recommended gounding method would be to ground all telecom equipment and infrastructure (conduits and cable trays and ladder racks) to the TGB in the room and the TMGB gounded to the MAIN electrical service ground, in addition to building steel at the telecom room.
I can be corrected, but the NEC requirements for grounding are to an approved ground (the electrical grounding system). The secondary grounding can be made to the steel, pipes, etc.
By VE'ing the grounding to the electrical system, you could be violating the NEC.
The recommended gounding method would be to ground all telecom equipment and infrastructure (conduits and cable trays and ladder racks) to the TGB in the room and the TMGB gounded to the MAIN electrical service ground, in addition to building steel at the telecom room.
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