Pump Motor – Is Adding a Time Delay/Dual Element Fuse a Good Idea

The top or bottom edges of a beam are the worst places to cut. It is where the most stress occurs. This is one of the reasons why it is best to run wiring/plumbing through holes in the center of your beams. Will it cause a problem? That is impossible to know, unless we also knew how much of a load you would be adding up there, the dimensions of these beams, etc.

While it is very possible there would be no problem, remember that those rafters were put there with no plans for a floor above. The structure may not have been designed to take a load. So if these are 2x4 rafters, on which you will then install a waterbed or a hot tub, expect problems. If you will be just using that floor to store a few light boxes, it probably won't be an issue.

If the floor that you add consists of 4x8 sheets of plywood, they will add considerable stiffness to the floor, but they will also add weight. As an alternative, you might consider adding sleepers on top of the rafters, which would allow you to avoid cutting into these members at all.

Finally, remember to be very careful in nailing/screwing down the new floor. A nail through an electrical line tends to be bad news.

I don't see induction motors as being particularly slow to start, so the answer is yes, it should be suitable.

There is no reason from a plumbing point of view why the booster pump has to be under the sink. It can be anywhere on the supply line to the kitchen sink. This may allow you to put the pump where it's noise is less of a problem. Oh, wait: If you are boosting the mixed water, it would need to be near. And if you aren't, you are going to pump water in circles through the mixing valve.

I dont see why an induction motor would be any quieter either. Noise may be due to resonance between the pump and the plumbing. This can be markedly reduced if you can use rubber hoses for the linkage instead of metal pipe. Mounting the motor on a resiliant pad can help too.

In general a more massive motor tends to be quieter, better bearings tend to be quieter. Induction motors may have better bearings.

Can the pressure in the whole house use a boost? Would a house sized booster pump and a pressure tank for the entire house be appropriate?