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Appendix C: Grounding Requirements
Proper grounding is fundamental for the MERLIN Plus Communications
System for protection against:
●
●
●
●
BEFORE YOU
POWER ON
Lightning
Power surges
Power crosses on Central Office (CO) lines
Static discharge
TURN THE
Check the following considerations before you turn the power on for the
MERLIN Plus system.
Grounding Requirements
The control unit, the CO line protector, and the ac power service panel
should be as close to each other as possible. The adequacy of lightning
protection is a direct function of the distance between these pieces of
equipment.
Recognizing that equipment may be spread throughout a building, the
National Electric Code requires that the ground point for the CO line
protector must be bonded to the ac power ground. Proper grounding helps
prevent equipment damage due to lightning energy and/or power transients
conducted into the equipment via CO and ac power lines.
CO Line Protector Tests
The following tests verify proper grounding and bonding of the CO line
protector. These tests should be performed on every new installation. You
will need a volt-ohm-millimeter (VOM) capable of measuring 115 VAC.
CAUTION: This test procedure is for experienced technicians only— do not
perform this or any other electrical measurement unless you have the
proper training and experience. You may prefer that a properly
certified electrician perform this procedure.
WARNING: Hazardous voltages that may cause death or injury are
present during the following tests. Use great care when working with
ac power line voltages.
At the common equipment location:
1 Set the VOM to the scale on which you can read 115 VAC.
2
Measure ac outlet voltages as follows:
● Hot to third wire (green wire) ground-should be about 115 VAC.
● Neutral to third wire ground-should be less than 2.5 VAC.
NOTE: Any circuit tester, such as the IDEAL EZ CHECK circuit tester
(IDEAL Industries, INC., model 61035), may be used instead of the VOM
to determine whether or not an outlet is wired properly.
If the voltages measured are not as required in this step, inform the
customer that he must have his electrician install a dedicated, properly
grounded ac outlet.
Appendix C: Grounding Requirements
61