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POWERING TECHNOLOGY
Manual No. MS0027-MAN rev. 4
guardian_access_3u_ms27-man-rev4-0817.indd
3.1.7 Electrical Safety Warnings
The following are electrical safety recommendations for working near the Power System:
WARNING Observe low voltage safety precautions before attempting to work on the
system when power is connected. Potentially lethal voltages are present within the system.
WARNING Caution must be exercised when handling system power cables. Damage to
the insulation or contact points of cables can cause contact with lethal voltages. For safety
reasons, cables should be connected to the power system before power is applied.
• Remove all metallic jewelry like watches or rings that may present a hazard while
working on the power system.
• Before connecting the AC input source to the power system, always verify voltage.
• Verify the AC source capacity. See system specications for AC information.
• All AC connections must conform to local codes and regulations, e.g. ANSI, CEC,
NEC, etc.
• When making AC connections, all AC power and DC load distribution breakers should
be in the OFF position.
• All circuit breakers should meet the original design specications of the system. In
addition, equipment connected to the system should not overload the circuit breakers
as this may have a negative eect on overcurrent protection and supply wiring, causing
system or user harm.
• Verify the DC capacity before making connections. See system specications for DC
information.
• Potentially lethal voltages are present within the system. Ensure that all power supplies
are completely isolated by turning all power switches OFF, disconnecting all relevant
connectors and removing all relevant breakers before attempting any maintenance
work. Do not rely on switches alone to isolate the power supply. Batteries should also
be disconnected.
• Potentially lethal voltages are present within this system. Ensure that low voltage
safety requirements are implemented before attempting to work on the system with
power connected.
• Potentially lethal voltages can be induced if the equipment is not grounded (earthed)
correctly. Ensure that all ground connections are secure.
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