Welcome to the
- Television Scanning Systems & Power Supplies -
Guess what, not only are the three standards incompatible, but .... and you're going to love this bit .... there are actually country specific variations of each type.
For the moment, don't worry too much about these standards, as Doktor Jon will explain more after the next specific factor, which is the CCTV cameras ....
If the unit is intended to be powered from the mains electricity supply, then quite obviously it should be capable of operating on that specific voltage (obviously, the same principle applies to any item of electrical equipment).
So for example, the mains supply in the United Kingdom is 240v AC 50 Hz. ('Hertz' - used to be known as 'cycles per second'), in some parts of Europe it's 220v AC 50 Hz., and in the United States it's 110v AC 60 Hz.
Nowadays, many cameras operate on much lower voltages, either 24v AC (make sure it's manufactured for the correct 'frequency' e.g. 50Hz.), 12 v DC which is actually a very flexible option (more about 12v later), and even occassionaly 'line powered' where the cameras power supply is carried up the same co-axial cable as the video signal.
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