Use a multimeter to check the resistance among mains pins over the plug - for nearly any clock motor, expect one thing in excess of 2k ohms for 230V and 1k for 120V motors. Have a Take note with the resistance examining, as you'll have to have it afterwards.
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The motor has become dismantled, plus the tails from the test winding are noticed sticking out from the motor housing. The examination winding applied is really only 9 turns, but it really won't issue as long as you know how many you will find.
This mixture of old and deteriorating insulation, not enough a safety earth, as well as Practically total insufficient any form of electrical safety criteria signifies that most of the remaining synchronous motor pushed clocks are very dangerous.
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About the Photograph beneath, the additional items of metal across the coil are for the alarm buzzer. The buzzer armature bridges the hole between The 2, but is not able to make strong Get hold of, so it simply just rattles with the alternating magnetic subject.
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Conclusion Given that a great number of of such clocks have worked as initially crafted for thus prolonged, it could appear to be odd to counsel that there's a safety issue. According to the three clocks I have finished up to now and the additional one examined, the Telechron might be the one one I might belief in the least (because of it owning been varnish impregnated), but there are still significant issues. There are numerous ways in which insulation can fail, with a nearby lightning strike getting a favourite.
Should really another person be unaware from the existence or want for your isolation transformer, any safety advantage is immediately dropped. Ought to the clock alter hands several periods, it is nearly certain the transformer will not be utilised in some unspecified time in the future - It will probably be lost or discarded as 'not important'.
They address a very important interval in horology, and at their peak had been essentially the most accurate clocks accessible to the public. This stays accurate nowadays - extremely, not many present day quartz clocks can match the general prolonged-term precision of a mains pushed synchronous clock motor.
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There remains to be an actual risk of electric shock, since the output is at standard mains potential, so in case you Call equally sales opportunities at once you may still receive a (maybe deadly) shock. There's no difference between the complete output of the isolation transformer and standard mains, apart from that there is now not a particular active (Are living) and neutral conductor.
Again, presented the age of the clock and its insulation, it can not be regarded as honest. The outer insulation around the coil was so brittle that it just fell to parts if the coil was faraway from the housing and magnetic pole-items.
For this reason, if a variety of clocks are connected to the identical transformer and 1 develops a fault, a lethal problem can however be developed. For these motives, I dislike the idea of employing mains isolation transformers except beneath incredibly specific situations.