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• Use one hand, whenever possible, to connect or disconnect signal cables to avoid a possible shock from
touching two surfaces with different electrical grounds.
• Connect the equipment to a three wire AC outlet (two poles plus ground). The receptacle must be connected
to appropriate branch circuit/mains protection (fuse or circuit breaker). Connection to any other type of
receptacle may result in a shock hazard.
• The protective earth conductor for the Symmetra RM carries the leakage current from the load devices
(computer equipment). Therefore, the size of the conductor must be at least as large as the wire required by
IEC 950. IEC 950 states the following nominal cross-sectional areas:
Cross-sectional Area Rated Current Range
(mm
2
) AWG (A)
2.5 12 17 – 25
6 8 33 – 40
10 6 41 – 63
16 4 64 – 80
• An insulated grounding conductor that is identical in size, insulation material, and thickness to the grounded
and ungrounded branch-circuit supply conductors, except that it is green with or without a yellow stripe is to
be installed as part of the branch circuit that supplies the Symmetra.
• The grounding conductor described above is to be grounded to earth at the service equipment, or if supplied
by a separately derived system, at the supply transformer or motor-generator set.
• The attachment-plug receptacles in the vicinity of the unit or subsystem are all to be of a grounding type, and
the grounding conductors serving these receptacles are to be connected to earth ground at the service
equipment.
Deenergizing Safety
• To remove all power from the Symmetra RM (Total Power Off), the following series of events must occur in
the order listed:
1. Set the system enable switch to stand by
.
2. Set the input circuit breaker to stand by
.
3. Remove the battery modules.
4. Disconnect the external battery pack (if provided).
5. Disconnect the Symmetra RM from the mains/circuit branch.
• Use of this equipment in life support applications where failure of this equipment can reasonably be expected
to cause the failure of the life support equipment or to significantly effect its safety or effectiveness is not
recommended.
Battery Safety
• Risk of electrical shock and and energy hazard (120 V, 5 ampere-hour battery). Before
replacing batteries, remove conductive jewelry such as chains, wrist watches, and rings.
High short circuit current through conductive materials could cause severe burns.
• Do not dispose of batteries in a fire. The batteries may explode.
• Do not open or mutilate batteries. They contain electrolyte that is toxic and harmful to
the skin and eyes.
Batteries must be recycled. Deliver the battery to an appropriate recycling facility or ship it to
the supplier in the new battery’s packing material. See the new battery instructions for more
information.
• Store the battery module(s) in a cool ambient temperature of < 25 °C.
• When replacing batteries, use only the same APC battery pack (SYBT2).