Emerson Liebert Static Transfer Switch - Manual (Page 11)

Safety Precautions
3
1.0 S
AFETY
P
RECAUTIONS
Read this manual thoroughly before working with the static transfer switch.
Be sure to review the warning under Important Safety Instructions on page 1.
Refer to the Handling Considerations on page 5 before attempting to move the unit.
Under typical operation and with the doors closed, only normal safety precautions are necessary. The
area around the static transfer switch should be kept free from puddles of water, excess moisture and
debris. The vent grate in the front of the system should not be obstructed in order to ensure a smooth
air flow through the unit for cooling.
ONLY qualified service personnel should perform maintenance on the static transfer switch. When
performing maintenance on any part of the equipment under power, service personnel and test equip-
ment should be located on rubber mats. The service personnel should wear insulating shoes for isola-
tion from direct contact with the floor.
Unless all power is removed from the input sources to the unit, one person should never work alone. A
second person should be on hand to assist and summon help, should an accident occur.
Three types of messages are used throughout this manual to stress important text. Carefully read the
information below each Warning, Caution and Note and use professional skills and prudent care
when performing the actions described in that text.
A Warning indicates the presence of a possible serious, life-threatening condition. For example:
A Caution indicates a condition that could seriously damage the equipment and possibly injure per-
sonnel. For example:
A Note emphasizes important text. If the instructions are not properly followed, the equipment could
be damaged or may not properly operate. For example:
!
WARNING
The unit is supplied by more than one power source. The Unit contains hazardous voltages if
any of the input sources is ON, even when the unit is in bypass. To isolate the unit, turn OFF
and lock out ALL input power sources.
Verify that all input power sources are de-energized and locked out before making connections
inside unit.
Lethal voltages exist inside the unit during normal operation. only qualified service personnel
should perform maintenance on the static switch.
!
CAUTION
Risk of unit damage
The input sources to the static switch must be grounded-wye sources. input sources other
than solidly grounded-wye sources may cause damage to the switch.
NOTE
Read this entire manual before installing and operating the unit.