Samsung OfficeServ 7400 Technical Manual page 8

OfficeServ 7400
TECHNICAL MANUAL
1.2 GROUNDING CONDITIONS
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.
WARNING: HIGH LEAKAGE CURRENT! Earth connection is essential before
connecting supply.
The OfficeServ 7400 system requires that a supplementary earth ground be connected
to the system. This is the preferred method of grounding the OfficeServ 7400. It should
be noted that when the third wire ground becomes inferior it many prevent the digital
data bus from canceling out noise. This may result in erratic operation of the OfficeServ
7400. Another problem that has occurred is that some UPS battery systems do not
pass the ground through to the power cord resulting in no ground to the system. The
ground lug in the back of the cabinet must be connected to one of the following:
bonded building steel, cold water pipe or a ground rod using at least #16 AWG copper
wire. Additionally, the ground between cabinets in a multiple cabinet system must also
be at least #16 AWG copper wire. The third wire AC ground or Field Ground is
connected to the system frame via the ground strap from the ground connector on the
AC socket.
A supplementary equipment grounding conductor shall be installed between the
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 in Part K of 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
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INSTALLATION
PART 1 JUNE 2006