There have been recent postings on internet bulletin boards about high voltages being measured on some laptop computers when connected to their mains power supplies (PSUs). They are what is called "double insulated" and do not require a safety earth connection. Unfortunately this also means that the low-voltage supply to the laptop then "floats" to typically half the mains supply voltage (i.e. about 115 volts AC in the UK). There is not enough current to electrocute you, but it does expose you to high levels of electric fields of several hundreds of volts per metre at your hands (and lap). So, if you are buying a new laptop, we suggest that you choose one with a 3-pin mains connector on the PSU. If it does not have a 3-pin mains connector, we suggest you use a safety Earthing Lead when you use your laptop with its mains PSU. We supply these either with or without a UK plug fitted. Plugs supplied are standard UK 3 pin plugs, so if you are ordering from outside the UK, we suggest you buy them without plugs, and fit your own.
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