If so desired you can provide a 400vAC three-phase supply to a caravan but you must not exceed 48vDC. Any one know or care to speculate on the reason for the DC limit?
I think Chris may have the answer there, that there's all kinds of extra protection available on the AC side, but trust me, you CAN feel 48-50v DC (phoneline while standing on a concrete basement floor with bare feet, and no it wasn't ringing, that feels a LOT more exciting)... I'd imgaine being a metal framed and bodied building, the chances of you being well earthed while getting in contact with a 'live' dc supply are much higher in a caravan/motorhome than in a normal house. I wonder if you could exceed it by centre tapping the battery to 'frame' or 'earth' ? (I don't have my copy of 7671 to hand, it's in the car and it's cold out)
I think Chris may have the answer there, that there's all kinds of extra protection available on the AC side, but trust me, you CAN feel 48-50v DC (phoneline while standing on a concrete basement floor with bare feet, and no it wasn't ringing, that feels a LOT more exciting)... I'd imgaine being a metal framed and bodied building, the chances of you being well earthed while getting in contact with a 'live' dc supply are much higher in a caravan/motorhome than in a normal house. I wonder if you could exceed it by centre tapping the battery to 'frame' or 'earth' ? (I don't have my copy of 7671 to hand, it's in the car and it's cold out)
