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Shore power breaker

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Commadore
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Joined: 12 April 2005
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    Posted: 18 August 2023 at 03:44
I have a new problem on my old 2006 H400e.  My AC power cuts out sometimes and then comes on again.  None of the visible breakers are tripping and I seem to still have power on the shore power plug at the inlet to the boat (at least itís blue LED is lit up).  This happens when I have a little more load on the circuit (pressure washer or hair dryer).  The power doesnít brown out, it just drops abruptly from 115v to zero.   I was measuring at the input to the breaker panel (the blue sea panel under the chart table).   Itís as if there is a self-resetting thermal breaker somewhere between the power inlet and the breakers, but I canít find one.  I understand new boats are supposed to have a breaker within 10 feet of the inlet so maybe there is one somewhere but I could sure use some help finding it.
Maybe thereís a bad connection somewhere but itís strange that the power snaps off and on again instead of browning out.  Nect chance Iíll unscrew the power inlet and pull it into the cockpit so I can monitor the power right at the socket.  Any info or hypotheses are appreciated!
"Kerkyra" 400e #042
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ggerrit Quote  Post ReplyReply Direct Link To This Post Posted: 18 August 2023 at 10:58
Hi The shore power comes in at the portside at the stern, in the place behind the cabin ,above your head is a circuitbraker.
This is the situation mine 400.
Gerard
H400 2008 2 cabin
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ratbasher Quote  Post ReplyReply Direct Link To This Post Posted: 18 August 2023 at 16:09
Gerard's right; do a 'face-up backwards crawl' into the lazarette on the port side and you'll see the breaker on the bulkhead up to your left.   
H400 (2008) 'Wight Leopard' now hibernating Gosport UK until April
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 19 August 2023 at 09:04
My 400 left the yard in december 2005, and comparing to the photo on page 16 of the "Kerkyra Operations Manual", my 230V AC curcuit breaker is of a different type than yours. The idea of a separate breaker in the lazarette is new to me.
The theory of a curcuit breaker cutting in and out when it is in the mood to do so sounds strange. When the breaker is tripped, it can not reset itself.
I would rather look at the AC power inlet box in the stern. After 17 years in a salty environment there may be a bad connection in the box.
I changed the power inlet box some years ago since the lid broke. This year the lid broke again, and I again had to buy a replacement. (Cheap plastic).
:Kjeld


Edited by Captain Cook - 19 August 2023 at 09:10
Freya H400 #27 (2006), 40HP 3JH4E, 2-cabin, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M603(VHF)+M802(SSB)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dogscout Quote  Post ReplyReply Direct Link To This Post Posted: 19 August 2023 at 11:59
On my 430 there was a 3 prong molex connector after the circuit breaker leading forward.   The pins were severely corroded and the wire between the breaker and connector melted and smoked once when I had my Honda 22i connected to the shire power socket.  

This was a diaper filling moment mid Atlantic.  Check that connector!

Adventure awaits
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Post Options Post Options   Thanks (0) Thanks(0)   Quote landlocked Quote  Post ReplyReply Direct Link To This Post Posted: 20 August 2023 at 04:01
Thanks everyone for your comments.   The inlet socket and the power cord both seem to be in good shape - no sign of corrosion or heat damage.  There isnít any breaker device in the lazarette, the inlet wiring just enters a conduit that takes it forward under the port berth.  Next time Iím on shore power Iíll re-create the condition and measure the voltage at the inlet socket and see if I can narrow it down.
"Kerkyra" 400e #042
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Post Options Post Options   Thanks (0) Thanks(0)   Quote landlocked Quote  Post ReplyReply Direct Link To This Post Posted: 05 September 2023 at 01:38
Update on this shore power issue.  It turns out I do indeed have a self-resetting thermal fuse.   Itís built into the ďSmartPlugĒ power inlet that was installed over 10 years ago.   There is no mention of this on the SmartPlug website because they stopped putting the thermal fuse in the inlets some time ago, due to concerns that people might touch the wires when the power has shut off and then get shocked when it self-resets.  I checked the inlet and there was no sign of heat damage.   The wire connections looked ok though there was a small amount of oxide.   The person who installed the inlet had crimped ferrules onto the wires before clamping them into the inlet and while these ferrules made a nice tight connection to the wires Iím not sure that they make a good connection to the clamps on the socket.   Those clamps are made to squash the wires and with the ferrules on the wires they donít squash and I think the contact area is reduced and that may be why I had some added resistance and heat.   I cut off the ferrules, stripped the wire, and worked some anti-oxidant into the wire strands before clamping them back in the socket.   So far so good, the circuit has passed the hairdryer test.   I never knew I had a thermal breaker there but I think itís a good thing and gave me some warning of a developing problem.
"Kerkyra" 400e #042
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ratbasher Quote  Post ReplyReply Direct Link To This Post Posted: 05 September 2023 at 09:48
At least no-one can accuse these boats of lacking Ďindividualityí! Thanks for posting, Owen
H400 (2008) 'Wight Leopard' now hibernating Gosport UK until April
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