Grounding Instructions - ADTRAN Atlas 550 User Manual

Chapter 2. Installation

GROUNDING INSTRUCTIONS

2-2
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.)
ATLAS 550 User Manual 61200305L1-1