Most of the breakers in a panel will be 120 VAC. Double height breakers are 240 VAC. A triple height breaker probably indicates you have 3-phase power in the panel.
Look to see if the 30 amp panel is fed with a two wire or a three wire. If it is a two wire then you are out of luck. If the panel is fed with a three wire then the panel should have the neutral terminated in the panel. It is this neutral that you need for 120 volt connections. You didn't state how many panel slots there are in the panel. If you are able install a 15 amp breaker into the panel and connect the wires going to the load. The black wire will go to the breaker and the white wire will go to the neutral bar in the panel.
The main breaker will have marking indicating size of electrical service, or if it is a fuse system....the fuses will have current ratings. If it is a subpanel, it might not have a main breaker. In this case you would have to look in the panel that the feed is coming from and find the size of the breaker that is feeding it. In either case you must look for the manufacturer's label that will have the maximum current the panel can handle, make sure the breaker feeding the panel doesn't exceed this rating.
It sounds like a loose connection. If it is all lights then look in main panel. If just some lights look at the switch first for loose connections. There is a good chance that the neutral from the service entrance cable to the panel is loose. BE VERY CAREFUL WHEN WORKING IN THE PANEL. Even when the main breaker is off, there is still some power in the panel. If in doubt, hire a licensed electrician.
There are a few different ways. If there is a disconnect before the panel, it is usually labeled with it's max capacity or what the maximum fuses are, assuming it is a fused disconnect. If no disconnect is present, look at the main breaker for the entire panel. You can always check the main wires coming into your panel but opening a panel is EXTREMELY DANGEROUS and should only be attempted by a trained Electrician.
Most of the breakers in a panel will be 120 VAC. Double height breakers are 240 VAC. A triple height breaker probably indicates you have 3-phase power in the panel.
Look to see if the 30 amp panel is fed with a two wire or a three wire. If it is a two wire then you are out of luck. If the panel is fed with a three wire then the panel should have the neutral terminated in the panel. It is this neutral that you need for 120 volt connections. You didn't state how many panel slots there are in the panel. If you are able install a 15 amp breaker into the panel and connect the wires going to the load. The black wire will go to the breaker and the white wire will go to the neutral bar in the panel.
If the breaker only trips once a week you may have a bad breaker or the breaker may not be large enough for your A/C unit. You should also have an electrician look for any loose connections from the unit to the breaker panel. (It is not uncommon to have a bad breaker)
The main breaker will have marking indicating size of electrical service, or if it is a fuse system....the fuses will have current ratings. If it is a subpanel, it might not have a main breaker. In this case you would have to look in the panel that the feed is coming from and find the size of the breaker that is feeding it. In either case you must look for the manufacturer's label that will have the maximum current the panel can handle, make sure the breaker feeding the panel doesn't exceed this rating.
There should be a breaker sticking out of it somewhere... it will look like a small red button. Push that in, and that should do it.
A 277/480V box should be clearly marked, but not always. The only way to be certain of a box's voltage is to use a voltmeter on it. This type of voltage is very dangerous. When voltages start to get this high, at best you may loose a finger or limb, at worst, you die. I recommend calling an electrician, who will be able to safely check this out.
The power windows are not run with a fuse. They use a circuit breaker. It should still be in the fuse box but will be much larger and look different than the typical fuse. It may be labled "pwr accsy".....or something like that.
That would depend on the application as there are many uses and shapes and specifications for a vacuum breaker
The home type used to be a little less expensive, and they do not have the little red flag when the breaker trips, The qo has the little red flag, which is eaiser to see, which breaker is tripped when you open the panel door the little red flag you can see where with the home style you look for the breaker that is not completly on. To me it was a step backwards with the introduction of the home style breaker we have installed both panels and Q O I prefer. And the breakers are not interchanable from panel to panel
On the passenger's side, duck down under the glove box and use a light to look up into the dash. There should a few vaccuum hoses and wire harnesses as well. Beyond that there is a little box with 2 nuts that has 2 bolts coming out of it. That is your circuit breaker panel.
It sounds like a loose connection. If it is all lights then look in main panel. If just some lights look at the switch first for loose connections. There is a good chance that the neutral from the service entrance cable to the panel is loose. BE VERY CAREFUL WHEN WORKING IN THE PANEL. Even when the main breaker is off, there is still some power in the panel. If in doubt, hire a licensed electrician.
Look under the panel where the dashlights are, there should be 2 screws.