Never assume anything about the NEC. It is written by electricians for
electricians and is plainly written for a national standard.
Sec. 830-30 is written so it can apply to both twisted pair and coaxial cabling,
underground and aerial mounting. The primary concern is lightning and power
cross and grounding the shield in an acceptable way satisfies both criteria.
Twisted pair without a shield requires primary protection in the NIU. Always
read the NEC slowly so that all the implications sink in. It takes a while to
adjust to the style.
I am no expert on the NEC. I can refer you to another post for more info.
[email protected] on 09/16/99 01:06:05 PM
Please respond to [email protected]
To: [email protected]
cc: (bcc: Ed Rauch/RFP/RELTECCORP)
Subject: NEC Coax Protection Requirements
Greetings!
Can anyone comment on the rationale for the difference in surge protection
requirements between Article 820-33 (Community Antenna Television and Radio
Distribution Systems) and Article 830-30 (Network-Powered Broadband
Communications Systems)?
In Article 820, it says that where the outer conductive shield of a coaxial
cable is grounded, no other protective devices shall be required. But in
article 830, which can also use coaxial cables, it says that primary
electrical protection shall be provided on all network-powered broadband
communications conductors that are not grounded. I'm assuming that this
means overvoltage surge protection and that they are talking about the center
conductor(s) of shielded coax.
Thanks for any comments or direction toward additional, background
information.
Don Turner
Siecor
847-699-2910
[email protected]
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