IT Difference

[clbrof]

Posted this in amongst another thread, however I fear it has been lost within it.

Going to wire boat for 32A supply. Will be using 2.35 kw oven, in addition to perhaps 2 kW of electric heaters, underfloor heating, fridge/freezer, tired of counting wattage and deciding what can be turned on and off on current boat.

Just noticed airlink have other 10kVA isolating transformers (non 'boaty') with the same IP rating....

boating one im looking at: http://www.airlinktr...ormers/BT10230/

industrial one http://www.airlinktr...ormers/WN10014/

7kva one: http://www.airlinktr...formers/WM7501/

Would prefer to stay at 10KVa as it means if it is under a 32A load, its not running at full whack, and will hopefully last a bit longer.

Can anyone tell me the difference between the boaty one and the industrial one?

Edited January 10, 2015 by clbrof

[nicknorman]

Posted this in amongst another thread, however I fear it has been lost within it.

 

Going to wire boat for 32A supply. Will be using 2.35 kw oven, in addition to perhaps 2 kW of electric heaters, underfloor heating, fridge/freezer, tired of counting wattage and deciding what can be turned on and off on current boat.

 

Just noticed airlink have other 10kVA isolating transformers (non 'boaty') with the same IP rating....

 

boating one im looking at: http://www.airlinktr...ormers/BT10230/

 

industrial one http://www.airlinktr...ormers/WN10014/

 

7kva one: http://www.airlinktr...formers/WM7501/

 

Would prefer to stay at 10KVa as it means if it is under a 32A load, its not running at full whack, and will hopefully last a bit longer.

 

Can anyone tell me the difference between the boaty one and the industrial one?

The industrial one is confusing. Whilst it says 230v in and out, within the spec there seems to be a 2:1 difference between input and output, both for voltage and current.

 

But that aside, perhaps there is a difference with the earthing arrangements - for a boat the earth mustn't pass through the transformer, whereas for an industrial one it doesn't matter if it does.

[smileypete]

Indl one in the description says:

 

Input vac: 415 Input current amps:

24.00

 

cheers, Pete.

~smpt~

[clbrof]

Well spotted Smileypete!!!

 

Perhaps this one is better?

 

http://www.airlinktransformers.com/industrial_transformers/enclosed_isolating_industrial_transformers/WN10012/

 

Also another difference is it states on the boat ones the earth is bonded to the neutral. Although Im sure i'll manage to do that on the industrial one?

Edited January 10, 2015 by clbrof

[Gypsey_Kings]

Also be aware of the CTE (centre tapped earth) - connect that to neutral at your peril !!!

[clbrof]

Thanks for pointing that out. I'll do a bit more research before I call the company on Monday to see what's suitable. Don't want to be unprepared and sold something which could have been bought cheaper. But it may seem they are not the same at all.

Edited January 11, 2015 by clbrof

[Batavia]

Check that the protective device on your shoreline supply won't trip due to the (relatively large, in this context) transformer's inrush current.

 

Some isolation transformers have devices to limit the inrush current - does the Airlink one?

 

Chris G

[b0atman]

is your shoreline supply 32amp ?

[clbrof]

Check that the protective device on your shoreline supply won't trip due to the (relatively large, in this context) transformer's inrush current.

 

Some isolation transformers have devices to limit the inrush current - does the Airlink one?

 

Chris G

 

Both the boat and industrial ones have surge protection? SL35 Surge limiter? is this the inrush limiter?

Edited January 11, 2015 by clbrof

[EEng]

 

Both the boat and industrial ones have surge protection? SL35 Surge limiter? is this the inrush limiter?

 

Possibly, most of these will have an NTC in series - this will limit the inrush current, although its a cheap (not so good) way of achieving this (pennies) rather than using a proper inrush limiter which would cost £'s not pennies.

 

The SL 35 is just their part number and could be any form of inrush limiter.

[blackrose]

These seem very expensive. What about the Airlink IT that Julian (Loddon) has posted the link to on numerous occasions? I'm sure that was around £260 before vat.

[clbrof]

There are more expensive because they can handle larger loads. However for the advantage of running higher amps my pocket is going to be at a serious disadvantage. Starting to revise my plans and perhaps just stay at 16A

[Batavia]

There are more expensive because they can handle larger loads. However for the advantage of running higher amps my pocket is going to be at a serious disadvantage. Starting to revise my plans and perhaps just stay at 16A

Also, if you have a smaller transformer, you will be paying less for the losses in the transformer - only a few % of its rating, but you will be paying for this electricity all the time the transformer is energised (OK, only for the iron losses while there is no load and the copper losses are proportional to the actual load).

 

Chris G

[Proper Job]

There are more expensive because they can handle larger loads. However for the advantage of running higher amps my pocket is going to be at a serious disadvantage. Starting to revise my plans and perhaps just stay at 16A

 

I doubt you'd get a shoreline connection >16 amps anyway. Unless you have it installed for your specific mooring.

 

In most instances many marina connections, although installed with 16 amp supply connectors, will not supply 16 amps