ATLAS 550 System Manual Section 3, Network Turnup Procedure
61200305L1-1F © 2002 ADTRAN, Inc. 53
4. GROUNDING INSTRUCTIONS
The following provides grounding instruction information from the Underwriters’ Laboratory UL60950
Standard for Safety of Information Technology Equipment Including Electrical Business Equipment, Third
Edition, of December 1, 2000.
An equipment grounding conductor that is not smaller in size than the ungrounded 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 serving these receptacles are to be connected to earth ground at
the service equipment.
A supplementary equipment grounding conductor shall be installed between 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 supplementary 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 raceway system, or to any grounded item that is permanently and reliably connected to the
electrical service equipment ground.
The supplemental grounding conductor shall be connected to the equipment using a number 8 ring terminal
and should be fastened to the grounding 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).
5. SUPPLYING POWER TO THE UNITAC Powered Systems
The AC powered ATLAS 550 comes equipped with a detachable 6-foot power cord with a 3-prong plug for
connecting to a grounded power receptacle. As shipped, the ATLAS 550 is set to factory default
conditions. After installing the unit and any option modules, the ATLAS 550 is ready for power-up. To
power-up the unit, ensure that the unit is properly connected to an appropriate power source and turn on the
unit using the on/off switch on the rear panel.
• Power to the ATLAS 550 AC system must be from a grounded 90-130/190-240 VAC,
50/60 Hz source.
• The power receptacle uses double-pole, neutral fusing.
• Maximum recommended ambient operating temperature is 45 oC.