30A is certainly less than 50A and 30A is all you should be able to adraw from EACH leg of 110VAC that you have attached via the "Y" cable. Actually, most circuit breakers are designed to trip at 80% of their rated load for constant loads. So, don't bank on more than 24A per 30A feed. The real concern is 220V vs 110V. If your 50A cable is 50A 220V then it's expecting two 110V feeds that are out of phase to create a voltage difference between the 2 110V feeds of 220V. Should you care...maybe. If your boat does not have 220V systems then you can use 2 110V feeds that are in phase. If you boat has 220V systems, such as A/C or any other high current system, then you MUST have two 110V feeds that are out of phase. As is always the case with power systems, be careful! A mistake can lead to the destruction of expensive systems and fire. Gil Get on board. You're invited to try the new Yahoo! Mail Beta.