LF: AquaLifter and float switches (Calgary)

[wingedfish]

Originally Posted by abcha0s@conceptaquatics

Wingedfish - I'm not doubting your setup, but I am curious. Are you putting the AC line voltage through the float switches? I have a number of concerns about that approach but the one that is easiest to convey is probably stray voltages.

Consider than when the switch is closed, the circuit is complete and current jumps between the two contact points. When the switch is open, the current will try to jump into your tank. Saltwater is a reasonable electrical conductor and the electricity will go looking for a ground in your tank. Have you noticed anything like this?

I suppose the hot wire is probably above the water line, but I think it would be difficult to completely isolate it.

Yes I'm running straight 120v throught the floats.

I'm no electrician, but current is a product of work. With the switch open, no work is being done and as long as the insulation is good, no electricity can stray. I can agree that an inductance can stray with current, but with the wattage involved in an aqualifter, it's a non issue compared to the unshielded inductance from heaters or lights.

It also doesn't matter which wire you splice as there will be 120v at the switch when open either way.

(none of this is legal or in any way should be played with by anyone unless they are willing to accept the consequences of high voltage around salt water)