LANNY HUGHES posted 03 Feb 2001
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?|
Roman Kitaev posted 05 Feb 2001
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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