I just replaced a small section of copper plumbing line with new copper plumb line which carries hot water to my sink. I just realized that there are some electrical lines that run underneath this hot water line and actually comes in contact with it. Is this a big deal? Would the hot water line melt the housing of the electrical line?

Cooktop kept blowing 50A breaker. Heard sizzling in breaker box. 1. Removed breaker box cover 2. Found cooktop negative wire sparking at connecting point of 50A breaker and screw completely backed out. (Appeared it was installed this way.) 3. Turned off main breaker and Tightened screw on 50A breaker to secure connection. 4. Left 50A breaker off to keep circuit isolated in case there was a problem with the cooktop itself. 5. While main power was off, Checked all other breaker/wire connections for tightness. No other problems. 6. Turned main breaker on. Experienced One Loud pop with sparks at the main breaker. It appeared they came from around the switch itself and maybe from the top of the breaker. Main power to house came on without delay, no further problems. No other breakers tripped. All appears normal. Main breaker is cool to the touch. 7. Turned on 50A breaker and cooktop. No arcing/sizzling. 8. Replaced panel cover. 8. Turned off main breaker, then back on. Operated normally. Did this one more time, no issues. In summary - I did not move any wires, just tightened the 50A breaker connection and left it off. Yet, when I turned on the main breaker back on, sparks flew. It did this only once and all now appears normal. (We have used this house in the past as a second home, so have turned the main breaker off and on when we were going to be away for long periods. Have never experienced anything like this before. My concern is two-fold. First - the obvious "what caused it?" Second - is the "tripping" feature of the breaker possibly fused now and I'm getting power straight from the meter box to the other sub breakers. I wouldn't think that would be possible, and if the breaker was bad, all power would be off. Thoughts anyone?