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3
4
5
6
7
8
9
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 CO protector ground lug and the third wire
ground of the nearest ac outlet on the circuit to be used. 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 5 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 5. 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. This check can be made with an ohmmeter
as measured previously at the common equipment outlet.
● Set the VOM to read ac voltage.
● Measure the ac outlet voltages at the outlet nearest the CO line
protector as follows:
—
Hot to third wire ground– should be about 115 VOM.
—
Neutral to third wire ground– should be less than 2.5 VOM.
If the voltage readings do not measure the values suggested, then the ac
outlet is improperly wired. Notify the customer that an electrician should
repair the outlet.
If the outlet is properly grounded, and either the resistance or voltage
measurement of the protector is not of proper value, call the local
telephone company Customer Operations Group (COG). Give the COG
the business name and address and request that the local telephone
company properly ground and bond the CO line protector to the ac
power.
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.
1
Connect the craft test set between the protector ground lug and the ring
2
3
side of the CO line.
If the dial tone is present, the protector is grounded.
If there is no dial tone, the protector is not grounded; notify the COG as
stated in step 9, above.
62
Appendix C: Grounding Requirements