DC breaker markings?
Have just noticed ++ next to the screw at the lower, or "open" end. I'm not an electrician, forgive me my ignorance. DC breaker is normally installed in the + wire anyway, so what is this cryptic ++ ...
Forum Discussion
The +++ isn't so much line as it is higher potential (i.e. higher voltage). For typical RV DC power distribution, this does happen to be the source side of the circuit, but it would be reversed if one had a positive ground system for some odd reason—which, while unique and annoying, is not a safety issue or a violation of any code I know of.
AC doesn't have polarity requirements like this, since the voltage is constantly alternating between positive and negative. So far as the breaker is concerned, there is no real difference between the line or the load side, and AC breakers and switches will work in either orientation.
AC breakers (at least residential ones with a thermal-magnetic curve) are not generally expected to hold their full current rating for long periods of time without tripping when they are installed in a panel. I think the typical rule of thumb is 80% continuous or so. That said, if the breaker is noticeably heating, it would not hurt to check that the wire and buss bar connections are all good and tight and undamaged.
AC doesn't have polarity requirements like this, since the voltage is constantly alternating between positive and negative. So far as the breaker is concerned, there is no real difference between the line or the load side, and AC breakers and switches will work in either orientation.
AC breakers (at least residential ones with a thermal-magnetic curve) are not generally expected to hold their full current rating for long periods of time without tripping when they are installed in a panel. I think the typical rule of thumb is 80% continuous or so. That said, if the breaker is noticeably heating, it would not hurt to check that the wire and buss bar connections are all good and tight and undamaged.
