Specifications

In addition, the ground to the protectors must be bonded to the ac service
ground. This bond is accomplished by connecting the two with AWG No. 6
wire.
The grounding and bonding of telephone line protectors is the responsibility
of your local telephone company. However, protectors may be missing, not
well grounded, or without the bond between the ac and telephone ground.
This protection is best tested by a trained technician.
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-milliammeter (VOM) capable of measuring 115 VAC.
CAUTION: This test procedure is for experienced technicians only-do not
perform this or any other electrical measurement test 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:
Visually verify that individual CO line protectors (carbon blocks, gas
tubes, etc.) are in place.
Set the VOM to the scale on which you can read 1 VAC.
Measure voltage between the CO protector ground lug and the third wire
ground of the nearest ac outlet on the branch circuit to be used by the
control unit. This voltage should be less than 1 VAC.
WARNING: If the ac voltage reading is greater than 1 volt, do not measure
resistance in the following step as this measurement could damage the
VOM.
If the voltage reading of step 3 is proper, set the VOM to the scale on
which you can read resistance (ohms). Read the resistance between the
same two points as in step 3. If the bonding of protector grounds is
proper, the resistance should be less than 1 ohm.
If the resistance measurement is greater than 1 ohm, the ac outlet should
be checked for proper ground. Use the procedure described above and
refer to Figure 8-2.
If the ac outlet is improperly wired, an electrician should repair the outlet.
If the outlet is properly grounded, and either the resistance or voltage
measurements of the protector is not of proper value, call the local
telephone company Customer Operations Group (COG). Give the COG
the name and address and request that the local telephone company
properly ground and bond the CO line protector to the ac power.
NOTE: If access to an ac outlet is not feasible, the following test can
be used to check protector grounding. This test does not check for
bonding of power and telephone company protector grounds.
6-4 MERLIN Plus System Installation