CertaUPS C500, Installation Manual, Page: 3 / 54

Personal Safety

RISK OF VOLTAGE BACKFEED. The system has its own power source (the
batteries). Isolate the UPS and check for hazardous voltage upstream and
downstream during operation. Terminal blocks may be energized even if the
system is disconnected from the AC power source.

Dangerous voltage levels are present within the system. It should be opened
exclusively by qualified service personnel.

The system must be properly grounded.

The batteries supplied within the system contain small amounts of toxic
materials. To avoid accidents, the directives listed below must be observed:
- Servicing of batteries should be performed or supervised by personnel
knowledgeable about batteries and the required safety precautions.
- When replacing batteries, replace with the same type and number of batteries
or battery packs.
- Do not dispose of batteries in a fire. The batteries may explode.
- Batteries constitute potential danger via electrical shock or burns. The short-
circuit current could be extremely high.

Precautions must be taken whenever handling batteries:
- Wear rubber gloves and boots.
- Do not lay tools or metal components on top of batteries.
- Disconnect charging source prior to connecting or disconnecting battery
terminals.
- Determine if batteries are inadvertently grounded. If inadvertently grounded,
remove source from ground. Contact with any part of a grounded battery can
result in electrical shock. The likelihood of this occurring can be reduced if
such grounds are removed during installation and maintenance (applicable to
equipment and remote battery supplies not having a grounded supply circuit).