Anyone who goes on a cruise liner will (probably) know that if you take a
multi-way mains block, to power multiple appliances from the single socket
that they normally provide, it must not incorporate surge protection. I
reckon Ikea in Southampton (almost opposite the cruise terminals) must do a
lot of business selling non-protected blocks. :-)
But why is this? What is it about the cruise electrical system (presumably
just a normal diesel-driven alternator with transformers) that means that it
is "unsafe" to use surge protection? Why is it any more of a problem than
with the electrics in a house? Surge protectors work by shorting out spikes
through a resistor, so is the cruise alternator generating so many spikes
than a significant amount of energy will be dissipated in each surge
I've been on a few cruses but never encountered this restriction. Is
it something in the booking terms, or a notice when you get on board.
My experience is luggage is not routinely searched, that would be a
truly mammoth task.
Perhaps your cruise line had an issue with MOVs in a power bar
catching fire and take the stance once bitten, twice shy.
It does seem a little odd, I have to say. Still I'd be glad that they even
allowed much to be plugged in. Back in the older days the ship supply was
not anything like the mains so I guess its progress.
This newsgroup posting comes to you directly from...
Ditto on not having had any warning regarding surge protection.
It maybe that they think they don’t need to. On the boats we’ve been on
nearly all the electrics shut down when you remove your keycard from the
wall holder. Took us a day or two to realise why some things weren’t
charging when we left the cabin!
Easily overcome with a bit of card shoved in the holder though.
A day trip on a Murray River Paddle steamer doesn’t equip you with that
All done to get away from your boring company by any chance.
No wonder you spend your life on Usenet in groups where you are a
Please insert predictable prewritten std attempt to insult below this line.
Don’t know if it is relevant to the surge protector situation but on some
of the cruise ships I did a small amount of fit out work on the 220volt
supply was 110-0 -110 so there is no neutral pin , I found that the
when relying on a thermostat turned to off on a refrigeration device while
I replaced a fan motor though in that case it was hard wired.
Most of them are 60Hz as well though that doesn’t cause the problems it
once did,I suppose the odd person may still take a favourite hair dryer and
wonder why it runs fast .
* yes I should have got it disconnected but although the equipment was my
firms and I was expected to repair it disconnecting it from the connection
box was down to a member of the ship electrical department and they had
gone ashore for the day on the turnaround.
On Friday, January 11, 2019 at 11:24:51 AM UTC-5, NY wrote:
Read specification numbers on a protector. How many joules does it 'block'
or 'absorb'? Hundreds? Thousand? That is near zero. A surge that tiny i
s routinely converted by electronic appliances into rock stable, low DC vol
tages to safely power semiconductors. So that power strip protector does n
othing useful. And can fail catastrophically on a transient that will not
damage anything else.
A thermal fuse blows to only disconnect grossly undersized protector parts.
It leaves appliance connected. Disconnects to avert a protector fire. S
ometimes that fuse does not trip fast enough. Then this happens: https://i
That fire, that happens in homes, is acceptable. That fire is completely u
nacceptable aboard ship. That fire is made obvious by specification number
s. How many joules will that five cent protector part absorb? A surge too
tiny to damage electronics can destroy that protector. And in rare cases,
cause a fire.
APC recently admitted some 15 million protectors must be removed immediatel
y due to hundreds of house fires. This protector is not even on that recall
Near zero joules and fire is why some cruise ships may confiscate a power s
trip protector. And others will constantly disconnect them.
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