wet locations

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 Question by LANNY HUGHES posted 03 Feb 2001
 wet locations
I am a state electrical inspector and have recently been required to inpect telecom installations. I am looking for cable sheathing ratings such as for wet locations(underslab)or direct burial.Most ratings I see talk about the spread of fire. Is the common CMP,CMG,CMR cables we see rated for damp or wet locations?
 Answer by Roman Kitaev posted 05 Feb 2001
Hello, Lanny!

CMP, CMG etc ratings define resistance of cables to spread of fire, but *do not* define their resistance to water penetration, low or high temperature and other environmental hazards.

I think the best point of reference for you is the TIA/EIA-758 standard titled "Customer-Owned Outside Plant Telecom Cabling Standard" (April 1999).

It states the following requirements:

(1) Twisted-pair copper cabling
a) Filled OSP cables shall meet the requirements of ANSI/ICEA S-84-608
b) Air core OSP cables shall meet the requirements of ANSI/ICEA S-85-625
c) Enganced performance filled OSP cables (referred as Broadband Outside Plant - BBOSP) shall meet the requirements of ANSI/ICEA S-99-689.
d) Enganced performance air core OSP cables shall meet the requirements of ANSI/ICEA S-98-688.

Filled cables are recommended for aerial, underground and direct-buried applications.

Air core cables are suitable for aerial and underground and are not recommended for direct-buried applications.

(2) Optical fiber cables
a) OSP optical fiber cables shall meet the physical requirements of ANSI/ICEA S-83-640.

Hope it helps,
Roman Kitaev, RCDD

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