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DEFINITY Made Easy Tools
Issue 3, December 2001
Install Telecommunications Cabling
Off-Premises Circuit Protection
Protection from hazardous voltages and currents is required for all off-premises (out of building) trunks, lines, and terminal installations. Both over-voltage protection (lightning, power induction, and so forth), and sneak current protection are required. Sneak current protectors must be either UL listed/CSA certified, or must comply with local safety standards.
Sneak current protectors must have a maximum rating of 350 mA, and a minimum voltage rating of 600 V, or as required by local regulations. The following devices protect the system from over-voltages:
- Analog trunks use the 507B sneak protector or equivalent. Over-voltage protection is normally provided by the local telephone company.
- Analog voice terminals use one of the following types of combined over-voltage and sneak current protection, or equivalent:
- Carbon block with heat coil for UL code 4B1C
- Gas tube with heat coil for UL code 4B1E-W
- Solid state with heat coil for UL code 4C1S
- DCP and ISDN-BRI terminals use the solid state 4C3S-75 with heat coil protector, or equivalent
- DS1/E1/T1 circuits require isolation from exposed facilities. This isolation may be provided by a CSU (T1), LIU (E1), or other equipment that provides equivalent protection
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| Copyright� 2001 Avaya Inc. |
| Send comments to MadeEasy Development Team |
| Always check at the Made Easy Web site for the most current information. |