ANSI SCTE 32-2016 pdf free download – Ampacity of Coaxial Telecommunications Cables.
This document provides the current carrying capacity or AMPACITY of coaxial cables used in the Telecommunications industry. The method used to calculate the tabulated ampacities is a thermodynamic model of a cable installed indoors in air and considers the heat flow from the inner and outer conductor through the dielectric and jacket materials.
It assumes that the conductors carrying current reach an operating temperature of 65°C based on the cables ability to dissipate heat. This temperature was chosen to substantially minimize the possibility of accelerated thermal aging of the dielectric and jacket materials. System designers are encouraged to consider the effect of this operating temperature on conductor resistance (R), voltage drop (IR) and power consumption (I2R).
The National Electrical Code (NEC) considers the most convenient and expeditious method of defining the ampacity of cables to be through the use of tables. The tabular format included in this document illustrates the ampacity of trunk, distribution and drop type coaxial cables commonly used in the Telecommunications industry. This procedure shall not be used to determine ground conductor size as referenced in NEC Article 810, 820 or 830 as applicable. The ampacity provided for trunk and distribution coaxial cables are for copper-clad aluminum center conductors and solid (smooth wall) aluminum outer conductors. Drop coaxial cable ampacity relate to cables with a copper-clad steel center conductor and a combination of aluminum tape(s) and braid(s), which represent the outer conductor.
2. Normative References
The following documents contain provisions, which, through reference in this text, constitute provisions of the standard. At the time of Subcommittee approval, the editions indicated were valid. All standards are subject to revision; and while parties to any agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of the documents listed below, they are reminded that newer editions of those documents may not be compatible with the referenced version.
2.1. SCTE References
2.2. Standards from other Organizations
• No references apply at this time
3. Informative References
The following documents may provide valuable information to the reader but are not required when complying with this standard.
• TFC Technical Note 1075, Alan J. Amato, Times Fiber Communications.
• The National Electrical Code Handbook
• The Calculation of the Temperature Rise and Load Capability of Cable, J.H. Neher and M.H.McGrath, AIEE, March 1957.
• The Current Carrying Capacity of Rubber Insulated Conductors, S.J. Rosch, AIEE, 4/38.ANSI SCTE 32 pdf download.