Shaver socket
- Thread starter canduit
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You can test for voltage without a load, but you can only test line to neutral as the socket is fed from an isolating transformer so there there is no reference to earth.
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Most shaver sockets have a switch worked by plugging in the plug so likely using meter probes would not work.
As already said isolated so need to test between L1 and L2 there is no neutral or earth it's a IT output (Insulated from Terrestrial connection).
Not all shaver transformers as continuous rated you need it to say tooth brush if used for charging a tooth brush most MK ones are designed to be used to charge a tooth brush.
As already said isolated so need to test between L1 and L2 there is no neutral or earth it's a IT output (Insulated from Terrestrial connection).
Not all shaver transformers as continuous rated you need it to say tooth brush if used for charging a tooth brush most MK ones are designed to be used to charge a tooth brush.
I made a little test lead with two spare female banana sockets on the end
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The MK ones have been rated for toothbrush charging for quite a while now. However if doesn't stop them cracking across the front after a year. Happened to two of mine.
Interesting. Wondered why mine had cracked.
What type of charger is the socket rated for ?. Is it a long period (12 hour ) low current trickle or a rapid ( 30 minute ) high current charger ?
Cracking suggests the whole transformer ( windings AND core ) has over heated before the thermal cut out ( that is usually in or close to the windings ) has reached trip temperature. With short heavy overloads the windings heat and the thermal trips before the mass of the iron core heats up. When there is a prolonged but lesser overload with a slow increase in winding temperature the core can become as hot as the windings before the trip operates.
Some small transformers can take a 300% overload for a few minutes without damage but a persistant 50% overload results in damage.
Cracking suggests the whole transformer ( windings AND core ) has over heated before the thermal cut out ( that is usually in or close to the windings ) has reached trip temperature. With short heavy overloads the windings heat and the thermal trips before the mass of the iron core heats up. When there is a prolonged but lesser overload with a slow increase in winding temperature the core can become as hot as the windings before the trip operates.
Some small transformers can take a 300% overload for a few minutes without damage but a persistant 50% overload results in damage.
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I think the point is that the sockets still work fine. It isn't overheating so much as that the plastic of the front panel just doesn't like being heated on one side for long periods.
I suspect that isn't what they have tested, when they claim the specification.
[K701 - Suitable for use with electric toothbrush chargers]
I suspect that isn't what they have tested, when they claim the specification.
[K701 - Suitable for use with electric toothbrush chargers]
I've invested in a new mk socket with the toothbrush symbol. Still gets hot after 30 mins. Haven't left it any longer.
I long ago invested in a non-isolated shaver socket which I put inside a cupboard.
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