On 6/1/2009, Gelfand, David wrote:
GR-1089 clause 4.6.9.2 intrabuilding surge test has an exemption for
shielded cables grounded at each end. This is supported by Verizon
document http://www.verizonnebs.com/TPRs/VZ-TPR-9305.pdf clause
7.2.12.1.
Does this reflect current practice?
Hi David:
So far I have always managed to avoid using this exemption, since my gut feel
is that it might create more problems than it solves. However, as the
requirements state, this is an allowable option for an installation with a CBN
grounding scheme.
These days most central offices use a CBN grounding scheme, but there may be
cases where an IBN system is still in place. Technically, the exemption can
only be used in a CBN system, although this may be hard to control in practice.
I don't know what sort of intrabuilding cable you are addressing, but if it is
something as simple as an Ethernet cable, it should not be necessary to invoke
this exemption.
Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848 (USA)
[email protected]
http://www.randolph-telecom.com <http://www.randolph-telecom.com/>
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