Dsg319
Senior Member
- Location
- West Virginia
- Occupation
- Wv Master “lectrician”
Scenario…..120/240vac single phase 200amp service. Only customer off of transformer.
Got a call lights blinking and turning off when charger plugged in. Got there andwas talking to the electrical inspector and we both figured typical bad service neutral.
Took some readings on incoming service conductors balanced voltages with around 6amperes line 1 and 5amperes line 2. And unbalanced current on neutral as should be. Plugged a 900w load on line 1and it’s remained 120volts and line 2completely 0volts.
But checked with a ticker on the incoming overhead service drop and still had power on line 1 and line 2. So losing it somewhere between the meter and service disco/main panel which is the same.
Even when load was removed it remained at 0volts line side of the service breaker. Took approximately 10minutes after removing-load for line 2 to come back.
Neutral was intact visually and took jumper wire from servicedisconnect to ground wire on pole which is bonded to neutral and got around 29ohm. With a little bit of that being my extended meter lead(500ft number 12).
Only other thing I noticed in the panel was a high resistance neutral to EGC bond(4ohms).
Didn’t have any correct size Main bonding jumper wire on so stuck a #12 in there and came down to maybe 3ohms. That’s needs fixed correctly I know.
Got a call lights blinking and turning off when charger plugged in. Got there andwas talking to the electrical inspector and we both figured typical bad service neutral.
Took some readings on incoming service conductors balanced voltages with around 6amperes line 1 and 5amperes line 2. And unbalanced current on neutral as should be. Plugged a 900w load on line 1and it’s remained 120volts and line 2completely 0volts.
But checked with a ticker on the incoming overhead service drop and still had power on line 1 and line 2. So losing it somewhere between the meter and service disco/main panel which is the same.
Even when load was removed it remained at 0volts line side of the service breaker. Took approximately 10minutes after removing-load for line 2 to come back.
Neutral was intact visually and took jumper wire from servicedisconnect to ground wire on pole which is bonded to neutral and got around 29ohm. With a little bit of that being my extended meter lead(500ft number 12).
Only other thing I noticed in the panel was a high resistance neutral to EGC bond(4ohms).
Didn’t have any correct size Main bonding jumper wire on so stuck a #12 in there and came down to maybe 3ohms. That’s needs fixed correctly I know.
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