I am attempting to replace my wall oven which was installed sometime in the 80's. I (think) I tripped all my circuit breakers and the wall oven still had power. Do I need to turn off the main power to the house or what could it be?
Any advice or assistance would be greatly appreciated.
Some homes have breakers in more than 1 location. Let me explain I have installed panels that the true main is at the meter and the panel that has all the lighting and outlets is a sub panel, check the box at your meter it may have several large breakers like 1 for the panel, 1 for the range and possibly 1 for out buildings and or RV pads in some cases this is a cheaper way to power the other devices because smaller feeder wires can be run to the main panel and possibly shorter feeders to the devices that are powered from the box at the meter.
When in doubt, always throw the main. Always, always, always.
Once the wall oven is uninstalled, you'll have a junction box there so you can work with your circuit. You, or a competant electrician, needs to investigate and make sure that oven wasn't wired into the main lugs of the panel, or that the breaker didn't fail and, somehow, weld itself into the 'on' position.
