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Precautions
• Install, service, and operate equipment only by professional, skilled and qualified personnel who
have the necessary knowledge and practical experience with electrical equipment and who
understand the hazards that can arise when working on this type of equipment.
• Disconnect batteries from outputs and/or follow safety procedures while working on equipment.
Batteries may be connected in parallel with the output of the rectifiers. Turning off the rectifiers
will not necessarily remove power from the bus.
• Do not disconnect permanent bonding connections unless all power inputs are disconnected.
• Verify that equipment is properly safety earth grounded before connecting power. High leakage
currents may be possible.
• Exercise care and follow all safety warnings and practices when servicing this equipment.
Hazardous energy and voltages are present in the unit and on the interface cables that can shock or
cause serious injury. When equipped with ringer modules, hazardous voltages will be present on the
ringer output connectors.
• Use the following precautions in addition to proper job training and safety procedures:
• Use only properly insulated tools.
• Remove all metallic objects (key chains, glasses, rings, watches, or other jewelry).
• Follow Lock Out Tag Out (LOTO) procedures: customer specified, site specific, or general as
appropriate. Disconnect all power input before servicing the equipment. Check for multiple
power inputs.
• Wear safety glasses.
• Follow Personal Protective Equipment requirements: customer specified, site specific, or general
as appropriate.
• Test circuits before touching.
• Be aware of potential hazards before servicing equipment.
• Identify exposed hazardous electrical potentials on connectors, wiring, etc.
• Avoid contacting circuits when removing or replacing covers;.
• Use a personal ESD strap when accessing or removing electronic components.
• Follow procedures for working at heights more than 4ft above the floor: customer specified, site
specific, or general as appropriate.
• Personnel with electronic medical devices need to be aware that proximity to DC power and
distribution systems, including batteries and cables, typically found in telecommunications utility
rooms, can affect medical electronic devices, such as pacemakers. Effects decrease with distance.
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