Mike Dolt Enterprises
Mike Dolt Enterprises
User: dcooper, Location: Ma
Asked on: Tuesday, April 5, 2011 at 8:52 pm EDT
Answered on: Tuesday, May 14, 2024 at 3:49 am EDT
Question: I just finished a project complete gut and remodel of 6 units. New service the whole 9 yards. We habe been done for a couple months 100% signed off and finished.1st I get a call from the developer asking why the light bulbs keep burning out.2nd I get a call saying they blew a fuse in 2 120v gas hot water heaters3rd blew a fuse in a 120v gas dryer.Hmmmm...I go there check my neutrals.They were tight.Then I read 124.5 volts on each phase (single phase serice) to groundSo the light bulbs were 120v rated...changed them to 130v rated.Now the equipment??????? Is the 124.5 volts blowing these fuses?I have the power company involved but that is just more questions than anwersWhat do ya think.... anyone....anyone.....anyone
Possible Causes of Fuse Blowing
1. Overvoltage
124.5 volts may be too high for the fuses in the hot water heaters and dryer, causing them to blow. Check the voltage at the panel and at the units to confirm the voltage is within the acceptable range for the equipment.
2. Line-to-Neutral Faults
If the neutral is loose or disconnected, it can cause the voltage on the other legs to rise above 120 volts, leading to overvoltage. Inspect all neutral connections and ensure they are tight and secure.
3. Ground Faults
A ground fault can also cause overvoltage on the other legs. Check for any ground faults using a ground fault circuit interrupter (GFCI) or multimeter.
4. Faulty Equipment
While it's possible that the overvoltage is blowing the fuses, it's also worth checking the equipment itself. Inspect the hot water heaters and dryer for any signs of damage or malfunction.
Steps to Take
1. Contact the Power Company
As you have already done, contact the power company to investigate the overvoltage issue.
2. Check the Voltage
Measure the voltage at the panel and at the affected units with a voltmeter. Verify that the voltage is within the acceptable range for the equipment.
3. Inspect the Neutral
Check all neutral connections throughout the system. Ensure they are tight and secure to prevent line-to-neutral faults.
4. Check for Ground Faults
Use a GFCI or multimeter to check for ground faults. If a fault is detected, repair or replace the affected components.
5. Inspect Equipment
Examine the hot water heaters and dryer for any signs of damage or malfunction. Consult with a qualified technician or manufacturer for further troubleshooting and repairs.
Additional Tips: Consider installing surge protectors to protect sensitive equipment from voltage fluctuations. Regularly inspect and maintain your electrical system to prevent future problems. Consult with a licensed electrician if you are unsure about any aspect of the troubleshooting or repairs. Flag for review