Originally Posted by skipper194242
if every thing in edlectrical service installed as per nec there is no reason to get that kind of voltage drop. demand factors should have been applied to park service. as to your question on hard start capacitors they have different ones. some have a relay to put cap into line and some just couple across the run capacitor and are generic according to tonnage of a/c.
I have used a lot of hard start caps over the years, but to quite honestly unless your trying to start against a high head pressure (hot compressor without time to equlize after shut down) you shouldn't need a hard start cap.
If the voltage is to low to start the compressor without a hard start cap you shouldn't be trying to run it under those conditions. Also the new AC's have a 5 minute time delay built into them so you don't have to deal with a hot compressor syndrome.
If you have a low voltage I am betting that there is a problem with the breaker at the pedestal. Its not uncommon for those to fail. They are turned on and of hundreds of time over ther life and they get weak (manufacture says it trips you should replace it, I don't believe thats true but after a couple of dozon times it wii effect it). Lastly most of the 50 amp pedestal services are wired with alunimum wire and over time the screws will work loose and that will cause a voltage drop under a load.
The best way to check the voltage at a breaker is under load, loose wires don't always show up with out a load. Also put your hand on the face of the breaker if it is anything more than comfortably warm. There is a problem related to the breaker eather overload, bad breaker, or loose wires.
OK I am done sorry to ramble on