ADTRAN 550 user manual Grounding Instructions

Chapter 2. Installation

GROUNDING INSTRUCTIONS

This section provides grounding instruction information from the Under- writers' Laboratory UL 1950 Standard for Safety of Information Technology Equipment Including Electrical Business Equipment, of July 28, 1995.

An equipment grounding conductor that is not smaller in size than the un- grounded branch-circuit supply conductors is to be installed as part of the circuit that supplies the product or system. Bare, covered, or insulated grounding conductors are acceptable. Individually covered or insulated equipment grounding conductors shall have a continuous outer finish that is either green, or green with one or more yellow stripes. The equipment grounding conductor is to be connected to ground at the service equipment.

The attachment-plug receptacles in the vicinity of the product or system are all to be of a grounding type, and the equipment grounding conductors serv- ing these receptacles are to be connected to earth ground at the service equipment.

A supplementary equipment grounding conductor shall be installed be- tween the product or system and ground that is in addition to the equipment grounding conductor in the power supply cord.

The supplementary equipment grounding conductor shall not be smaller in size than the ungrounded branch-circuit supply conductors. The supple- mentary equipment grounding conductor shall be connected to the product at the terminal provided, and shall be connected to ground in a manner that will retain the ground connection when the product is unplugged from the receptacle. The connection to ground of the supplementary equipment grounding conductor shall be in compliance with the rules for terminating bonding jumpers at Part K or Article 250 of the National Electrical Code, ANSI/NFPA 70. Termination of the supplementary equipment grounding conductor is permitted to be made to building steel, to a metal electrical race- way system, or to any grounded item that is permanently and reliably con- nected to the electrical service equipment ground.

The supplemental grounding conductor shall be connected to the equip- ment using a number 8 ring terminal and should be fastened to the ground- ing lug provided on the rear panel of the equipment. The ring terminal should be installed using the appropriate crimping tool (AMP P/N 59250 T-EAD Crimping Tool or equivalent.)

2-2 ATLAS 550 User Manual 61200305L1-1