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hi youtubers jeff cote here  we've got another installment of ask pys  so we've got a question from a fellow  motor mike who's got  a grand banks 36 classic  mike is about to install a new generator  um  and he's also wants to upgrade his shore  power from 30 amps to 50 amps  and his question to me is i currently  don't have any galvanic isolator on my  ground banks  what isolator would you recommend when  i'm grading my shore power  so that's a good question um well first  of all  when you're buying a galvanic isolator  you want to make sure that you're buying  a galvin  isolator that is rated for the shore  power connection that you're connected  to  so some manufacturers will sell you a 30  amp or a 50 amp galvanic isolator  so first of all buy the correct one some  some other manufacturers actually make  you know they'll go from 30 amps to 67  amps so it doesn't really matter if it's  a 50 amp connection or 30 amp it's the  same model  but do your homework but more important  than actually making sure that your  galvanic isolator can handle the  amperage  what i would recommend is also make sure  that the galvanic isolator  if it ever was going to fail was going  to actually fail in a closed  circuit what does close mean i mean all  these terms in electricity i remember  even doing my engineering  it didn't make any sense it took me  years to actually truly figure it out  i was a slow learner as they say and i'm  like what do you mean close well close  is  basically managing a drawbridge right so  if you've got an open circuit  you're actually opening a drawbridge and  if you've got a castle and your  drawbridge is  literally lifted up you're basically got  a moat around your castle and no current  can go through  and that's basically called an open  circuit if you've got a closed circuit  now the drawbridge is down  right and close circuit means that  people can come in and out of your  castle  so what you want to do with a galvan  isolator is if it ever going to fail and  it could fail because of a power surge a  lightning strike  you want to make sure that your  grounding connection because remember in  ac  you know most boats you're going to have  a hot a neutral and a graph  or if with shore power it depends if  you've got 50 amp you might have a l1 l2  and a ground  but you're going to for sure have an ac  grounding connection  that ac grounding connection is there to  save your life  and in the past galvanic isolators would  not fail in a closed state they would  actually fail and open  that basically means that you do not  have ac grounding on your boat and  you're back to a two-wire system  which is no good that's like going 100  years ago when these homes had only two  wires  so what you want to do is make sure that  you buy a galvanic isolator that is  bail safe they've come in existence  about 10 15 years ago  and they're not as prevalent as i'd like  them to be because a lot of boaters  don't know about it but i'm a huge fan  of the galvanic isolators if you don't  have one  buy one and protect your underwater  metals from straight current corrosion  you for watching this video if you have  any questions please ask it below or use  our contact form on our website  support us to keep this channel ad free  happy to donate my time because i'm a  boater too  but help us offset the cost of doing  these videos by donating via paypal or  potentially buying some of our merch  on our store and don't forget to  subscribe  so that you can keep having these weekly  and we're producing almost four videos a  week now  and thanks again for watching