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Message: <blockquote data-quote="Terryl" data-source="post: 1070038" data-attributes="member: 369937">Yah, you cant get around ohms law with DC power, normal CAT5 lan cable has about 10 ohms of DC loop resistance per 100 meter's.So with that you can get about 4 ohms of DC loop resistance on a 40 meter run, (loop resistance = one wire for the + and one wire for the -) now the cameras wont take all the amperes that the 12 volt 1 amp power supply can supply, so lets say they take 700 mA at full load, using ohms law you get about a 2.8 volt drop at that current level.That may or may-not affect the camera at that end.Now the little DC power dongles supplied with the cameras may not have very strict DC regulation, so they may have enough over voltage to handle this drop.</blockquote>