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FX II System Installation and Maintenance

GCA39-823 Rev 1, Issue 9/01 Page 6 Printed in the USA

Power Requirements for the FX II Systems

• The FX II common equipment cabinets require a dedicated 115VAC 15 AMP circuit, with a

third-wire ground, supplied to standard NEMA 5-15R electrical outlet.

• To provide protection against surges and spikes that may appear on the AC line, install a

plug-in power line surge protector between the AC power cord of the installed equipment and

the AC outlet.

• The fuse for the switchable telephony power supply in the FXII is slow-blow type rated.

* The FXII fuse is rated at 3 AMPS and 250 volts.

Replacement fuses must have the same rating as the original fuse.

Grounding Options for the Common Equipment Cabinets

• Transient voltage spikes, if induced onto CO or Centrex lines, can travel through the cable

and into the common equipment.

• The Telephone Company offers basic protection against this condition but it is usually

designed to protect the central office circuits.

• To help ensure that external over-voltage surges do not damage the system, you should install

and properly ground primary protection devices, such as gas discharge tubes or similar

devices, on all lines.

• While the line boards have internal secondary surge protection on all line ports, for this

protection to be effective, you MUST connect the common equipment cabinet to a reliable,

effective earth ground.

• The FX II can maintain three types of grounds:

* Service Ground: A neutral power line wire that is connected to the ground bus in the

premises’ AC power panel.

* System Ground: A non-current carrying power line wire that is connected to the ground

bus in the premises’ AC power panel.

* Frame Ground: A low impedance conductor that places the common equipment cabinet

at reference ground potential. The frame ground provides the greatest safety by limiting

electrical potential between non-current carrying parts of the system. The common

equipment cabinet provides a ground stud on its cabinet for access to its frame ground.

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Comdial FX Series Especificaciones Pagina 12