10 Gauge Wire connected to a 40amp breaker... An Ounce of prevention is better than a pound of cure :} Need a home inspection in Mississippi? listing of Mississippi certified home inspectors. Re: 10 Gauge Wire connected to a 40amp breaker... Originally Posted by dnasser What does the AC unit label say? Originally Posted by cfoley1 That is correct, there are things like RLA (running load amps) and SLA (starting load amps) on certain appliances such as AC units. Typically the unbit will have a data plate on it that will tell you Max fuse/breaker size. "We Respect Our Clients Right To Privacy" Jim Keilson Certified Master Inspector State of Maryland License# 31141 Maryland Home Inspectors In Gaithersburg, Rockville, Germantown, Bethesda, Potomac, Also All of Northern Virginia and Washington, D.C. A 5 horse power 240 volt single phase motor is wired with #10 wire but protected by a 70 amp breaker Reference 430.22 and 430.52 of the NEC

When dealing with AC or heat pumps look at the name plate for MCA and MAX fuse or HARC breaker for the conductor and overcurrent sizes. These units have internal running overload that protects the motor and conductors. The fuses and breakers are installed for ground fault and short circuit purposes only Originally Posted by jwhittI never knew that. I always assumed, incorrectly, that the panel breaker was there to protect the compressor motor.You can't tell for sure. Without a micron gauge we do not know if the oil in the pump is clean. The oil in a vacuum pump acts as a blotter and absorbs all of the moisture and sediment in the system. As the oil becomes saturated, the efficiency of the pump is drastically reduced. Oil should be changed after every job and should only be changed when the oil is still hot. As the oil cools, the moisture separates from the oil and clings to the metal of the pump. Therefore, when changing the oil and not checking it with a micron gauge, you're still guessing as to whether the pump can actually pull the proper vacuum to eliminate the moisture in the system.

This can happen even if you pull on both sides of the system because there is a metering device to measure the pressure and refrigerant in the system. Air or moisture can be trapped in one side of the system and will eventually let go and therefore a higher reading on the micron gauge will occur. Sometimes moisture can be trapped in the oil of the compressor and when it escapes it will show up in the gauge. Some manufacturers have a micron range that they want their system pulled down to, so therefore, JB can only suggest a micron reading. Our suggestion is to pull a system down to 250-300 microns only if you are also pulling a vacuum on the compressor. Going below 250 microns, you will start degassing the oil in the compressor and it will not be the same lubricating oil as it was originally. The oil will only degass and will not suck up into the vacuum pump. Assuming that you are pulling on the high and low side of the system, did you remove the access valve cores? Leaving the cores in creates a big restriction and causes your vaccum to take a longer time to evacuate.

The gauge is too close to the pump and it does not have a chance to equalize in pressure. To do this experiment correctly, connect your pump and a micron gauge to a small tank with only copper tubing or JB`s DV-29. Close the blank off valve as you did before and you will see a big difference in the reading.self contained ac units for cars Either copper tubing or metal hoses used in JB`s DV-29 are the only ways you can hold vacuum. how much does a 4 ton ac unit cost installedVacuum is critical for leaks, more so than refrigerant. air conditioning unit interiorCharging hoses, including environmental hoses, still permeate. Beyond permeation, where the hose ferrule is crimped to the hose, represents a potential leak under vacuum.

Quick couplers with gaskets are not a good seal. When you screw down the male flare to the gasket quick coupler, the gasket goes into several contortions and will not seal properly. JB uses O-rings on our quick couplers and as you screw down the male flare you get a metal-to-metal seat and the O-ring lays around the flare to give it a perfect seal.You can pull a vacuum with charging hoses, but when you want to blank off the system to check for leaks, you will need to use copper tubing or metal hoses. Many technicians do this for ease of hook-up, but remember with this set up you are actually reading what the pump is doing and not what the pump is doing to the system. To prove this theory, take a 50 foot coil of 1/4" OD copper tubing, braze a flare on one end and a tee on the other. Attach a micron gauge to the male flare end, a gauge to the tee end, and a line from the tee to the pump. Turn the pump on and you will notice the side closest to the pump will be a lot lower than the other.

Eventually, this will equalize out and give the same reading. This will occur in a system on which you are pulling a vacuum.Series 5 advanced digital force gauges are designed for tension and compression force testing in numerous applications across virtually every industry, with capacities from 0.12 lb to 2,000 lbF (0.5 N to 10 kN). The gauges feature an industry-leading sampling rate of 7,000 Hz, producing accurate results even for quick-action tests. Accuracy is ±0.1% of full scale, and resolution is 1/5000. A large, backlit graphics LCD displays large, legible characters, while the simple menu navigation allows for quick access to the gauges’ many features and configurable parameters. Data can be transferred to a PC or other data collector via USB, RS-232, Mitutoyo (Digimatic), or analog outputs. On-board data memory for up to 1,000 readings is included, as are statistical calculations and output to a PC. Integrated set points with indicators are ideal for pass-fail testing and for triggering external devices such as an alarm, relay, or test stand.