Comdial FX Series Dokumentacja Pobierz pdf (Strona 13)

FX II System Installation and Maintenance

Printed in the USA Page 7 GCA39-823 Rev 1, Issue 9/01

• Make the ground connection with #6 or larger insulated, solid copper grounding wire.

Keep the ground wire separate from the three-wire AC line cord, do not splice it, and keep it

as short as possible.

• Be sure that all of the ground connections are visible for inspection and maintenance. Tag all

of the ground connections with a sign that reads: Do Not Remove or Disconnect.

• The picture below shows the location of the frame ground on the FX II system.

• Effective grounding requires that you connect the frame ground to a good earth ground. A

good earth ground is one such as the ground bus in the premises’ AC power panel or a public

metallic cold water pipe at a point immediately at its entrance to the premises and ahead of

any meters, pumps, or insulating sections that have been added for vibration reduction. Avoid

using the premises’ structural steel frame as it may not be at earth ground potential.

• The impedance of the wiring between the system and the earth ground must not exceed 0.25

ohms and the impedance between the earth ground and the power company’s reference

standard ground must not exceed 5 ohms. Use an acceptable low impedance measuring

device to measure the impedance of these paths. The #6 or larger wire size will minimize the

wiring impedance; however, if the impedance between earth ground and the power

company’s standard reference ground exceeds 5 ohms, contact the local power company. The

ground path must always be of sufficient current-carrying capacity to prevent a build up of

voltages that may result in circuit noise, hazard to personnel, or equipment damage.

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Comdial FX Series Dokumentacja Strona 13