{"id":109,"date":"2020-01-13T15:24:53","date_gmt":"2020-01-13T20:24:53","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/basicmotorcontrol\/?post_type=chapter&p=109"},"modified":"2020-08-14T18:29:53","modified_gmt":"2020-08-14T22:29:53","slug":"check-of-incoming-power","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/basicmotorcontrol\/chapter\/check-of-incoming-power\/","title":{"raw":"Check for Incoming Power","rendered":"Check for Incoming Power"},"content":{"raw":"Whenever equipment or circuits are not working, always start by confirming that there is [pb_glossary id=\"718\"]voltage<\/strong>[\/pb_glossary] available. If there is voltage at the source of supply, then you have confirmed that the problem is downstream from that point.\r\n\r\nIf the main [pb_glossary id=\"692\"]overcurrent<\/strong>[\/pb_glossary] protection is provided by a [pb_glossary id=\"888\"]circuit breaker<\/strong>[\/pb_glossary], check that the handle is in the \u201cOn\u201d position, and not the \u201cOff\u201d or \u201cTripped\u201d position. A circuit breaker indicates that it has tripped when the handle is in the centre position. To reset, push the handle fully off, then on. If the handle \u201ctrips\u201d again suddenly, then there is likely a short circuit somewhere bypassing a load.\r\n\r\nIf the main overcurrent protection is provided by a fusible disconnect, the status of the [pb_glossary id=\"696\"]fuses<\/strong>[\/pb_glossary] will determine if voltage is present. There are two tests that can confirm if a fuse link is intact: an [pb_glossary id=\"882\"]ohmmeter<\/strong>[\/pb_glossary] continuity test and the [pb_glossary id=\"890\"]crisscross voltmeter method<\/strong>[\/pb_glossary].","rendered":"

Whenever equipment or circuits are not working, always start by confirming that there is voltage<\/strong><\/a> available. If there is voltage at the source of supply, then you have confirmed that the problem is downstream from that point.<\/p>\n

If the main overcurrent<\/strong><\/a> protection is provided by a circuit breaker<\/strong><\/a>, check that the handle is in the \u201cOn\u201d position, and not the \u201cOff\u201d or \u201cTripped\u201d position. A circuit breaker indicates that it has tripped when the handle is in the centre position. To reset, push the handle fully off, then on. If the handle \u201ctrips\u201d again suddenly, then there is likely a short circuit somewhere bypassing a load.<\/p>\n

If the main overcurrent protection is provided by a fusible disconnect, the status of the fuses<\/strong><\/a> will determine if voltage is present. There are two tests that can confirm if a fuse link is intact: an ohmmeter<\/strong><\/a> continuity test and the crisscross voltmeter method<\/strong><\/a>.<\/p>\n

definition<\/span>