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Electrical Inspection & Testing Forum
I.R Test on an Isolated Motor on a live working Industrial Machine
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<blockquote data-quote="Phoenix" data-source="post: 416312" data-attributes="member: 8133"><p>It is I suppose possible if the windings have got very hot that the thermistor leads could be in contact with part of the windings, if this were the case then putting 500v WRT earth onto the windings would put 500v WRT earth on whatever the thermistor is connected to. This would be why the guidence by the manufacturers stated by SW is to tie both ends of it down to earth to that it cannot rise to anything WRT earth.</p><p></p><p>However, this is quite an unlikely situation and damage may have already occurred as the supply voltage would have been applied there when the motor was powered up</p></blockquote><p></p>
[QUOTE="Phoenix, post: 416312, member: 8133"] It is I suppose possible if the windings have got very hot that the thermistor leads could be in contact with part of the windings, if this were the case then putting 500v WRT earth onto the windings would put 500v WRT earth on whatever the thermistor is connected to. This would be why the guidence by the manufacturers stated by SW is to tie both ends of it down to earth to that it cannot rise to anything WRT earth. However, this is quite an unlikely situation and damage may have already occurred as the supply voltage would have been applied there when the motor was powered up [/QUOTE]
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