Loddon

The feed into my transformer from the socket is about 5-600mm but I still check ground continuity every time I plug or unplug it, as well as checking the main input cable. Not that I am paranoid.

Except there has to be one bill payer I believe, that would mean I would have to pay for my wifes phone. At present we have; 2 x phones on Smarty with 3gb data 1x dongle on Smarty with 50gb data, only active when on the boat and have 2 free months waiting to be used 1x home broadband on 3 unlimited I might well move it all under one bill when my 3 home broadband contract expires that wil be £5.10 a month saved and another free month for the boat.

I will admit i didn't read the article. I run payg on GiffGaff for the boat heating and the rates are similiar to the new 3 rates, It needs to be 2g hence why I was not on 3. It was brought home to me whilst I was testing a new system how expensive payg is compared to £5-6 for unlimited calls/txt, 60txts and you have spent the same as a month unlimited ETA If you dont need much data Smarty is £5 month unlimited.

Just found this on interweb https://www.1pmobile.com It runs on EE network.

That is not the reason The reason the metal box is a problem is because it could compromise the grounding of the boat thus rendering the IT ineffective. To be honest an IT should not even be on the boat but should be next to the supply on the bank as mine was for many years. I bought an Airlink transformer, possibly the first one they supplied for use on a boat, one of these https://airlinktransformers.com/product/enclosed-isolating-industrial-transformer-wm3602 This was before they developed the potted version which they did at my suggestion. Mine was in a metal enclosure that sat next to the supply in the shed at my old mooring. When I changed moorings 2 years ago some 13 years after it was installed I recased it in an HPDE box and it is now in a cupboard at the back of my boat fed by a double insulated cable enclosed in plastic conduit to try and prevent anything that may compromise the boats grounding. I much prefer a transformer off the boat and I even worry about cables feeding into the boat that if damaged could compromise the IT.

Its on freesat ch 155 freeview ch 91 At 10pm tonight