3Visually verify that individual CO line protectors (carbon blocks, gas tubes, etc) are in place.
4Set the VOM to the scale on which you can read 1 VAC.
5Measure 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.
6If 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.
7If 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.
8If 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.
9If 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.
1Connect the craft test set between the protector ground lug and the ring side of the CO line.
2If the dial tone is present, the protector is grounded.
3If there is no dial tone, the protector is not grounded; notify the COG as stated in step 9, above.
