Engine_2014 : Electricity - 1305/2299
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| The when testing insulation resistance of electric equipment and machinery, ideally when should the insulation resistance be tested for the lowest normal insulation values? |
| A) immediately after shutting down the machine |
| B) every time the brush rigging is adjusted |
| C) immediately after starting up the machine |
| D) every 30 days whether the machine is in use or not |
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