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Handling Energized Products

General Safety Practices

Do not touch or tamper with the power supply when the power cord is connected. Line voltages

may be present inside certain products even when the power switch (if installed) is in the OFF

position or a fuse is blown. For DC-powered products, although the voltages levels are usually

not hazardous, energy hazards may still exist.

Before working on equipment connected to power lines or telecommunication lines, remove

jewelry or any other metallic object that may come into contact with energized parts.

Unless otherwise specified, all products are intended to be grounded during normal use.

Grounding is provided by connecting the mains plug to a wall socket with a protective ground

terminal. If a ground lug is provided on the product, it should be connected to the protective

ground at all times, by a wire with a diameter of 18 AWG or wider. Rack-mounted equipment

should be mounted only in grounded racks and cabinets.

Always make the ground connection first and disconnect it last. Do not connect

telecommunication cables to ungrounded equipment. Make sure that all other cables are

disconnected before disconnecting the ground.

Some products may have panels secured by thumbscrews with a slotted head. These panels may

cover hazardous circuits or parts, such as power supplies. These thumbscrews should therefore

always be tightened securely with a screwdriver after both initial installation and subsequent

access to the panels.

Connecting AC Mains

Make sure that the electrical installation complies with local codes.

Always connect the AC plug to a wall socket with a protective ground.

The maximum permissible current capability of the branch distribution circuit that supplies power

to the product is 16A (20A for USA and Canada). The circuit breaker in the building installation

should have high breaking capacity and must operate at short-circuit current exceeding 35A (40A

for USA and Canada).

Always connect the power cord first to the equipment and then to the wall socket. If a power

switch is provided in the equipment, set it to the OFF position. If the power cord cannot be

readily disconnected in case of emergency, make sure that a readily accessible circuit breaker or

emergency switch is installed in the building installation.

In cases when the power distribution system is IT type, the switch must disconnect both poles

simultaneously.

Connecting DC Power

Unless otherwise specified in the manual, the DC input to the equipment is floating in reference

to the ground. Any single pole can be externally grounded.

Due to the high current capability of DC power systems, care should be taken when connecting

the DC supply to avoid short-circuits and fire hazards.

Make sure that the DC power supply is electrically isolated from any AC source and that the

installation complies with the local codes.

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