Why would only one side of a 240V water heater line blow fuses periodically when elements and voltages test OK?

Answer for USA, Canada and countries running a 60 Hz power supply service (LIFE SAFETY WARNING! Disclaimer Electricity is dangerous! You can be injured or killed!

Improper installations can cause fire, injury and death! Why would the same FUSE important keep blowing when conductors and voltage seem ok? Troubleshooting is the final measure of skill and knowledge!

It is the knowledge of how electricity works, and of the methods and materials used to create a functional wiring system, that enables a skilled troubleshooter to locate the problem and repair it Where should the "voltage" be, and how does it get there? And where shouldn't it be? I see two possible causes of your problem 1 There is a very high current draw, caused by an intermittent fault to ground in one conductor at some as yet undiscovered point 2 There is some heat source causing the FUSE a melting thermal device to open when there is normal current because there is not enough differential remaining between the fuse's ambient temperature and the melting point of the fusible element loose fitting fuseholder, loose screw connection, loose conductor termination, and so on .... ... or, of course, the installation was done by a hack and there is another load somewhere you haven't recognized Replace the elements, they are inexpensive, next check the wiring to ground.

Those are the things a homeowner can do. If there is still a problem call a Pro Thanks, Robert. Looking closer, I found that one of the fuse holders in the disconnect box was totally shot.

I am surprised I did not have a fire. Replaced the old disconnect with a new one using breakers. Everything fine now As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed Before you do any work yourself on electrical circuits, equipment or appliances always use a test meter to ensure the circuit is, in fact, de-energized IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB SAFELY AND COMPETENTLY REFER THIS WORK TO QUALIFIED PROFESSIONALS.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.