{"id":101,"date":"2021-03-23T19:35:23","date_gmt":"2021-03-23T23:35:23","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/chapter\/double-pole-single-throw-dpst\/"},"modified":"2021-04-21T14:47:47","modified_gmt":"2021-04-21T18:47:47","slug":"double-pole-single-throw-dpst","status":"publish","type":"chapter","link":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/chapter\/double-pole-single-throw-dpst\/","title":{"raw":"Double-pole, single-throw (DPST)","rendered":"Double-pole, single-throw (DPST)"},"content":{"raw":"This switch looks like a standard <strong>SPST<\/strong> switch from the outside but inside, instead of interrupting only one current-carrying conductor, it interrupts two. This makes it suitable for controlling and isolating loads that utilize two <strong>ungrounded<\/strong> conductors and operate at 240V single-phase.\r\n\r\n&nbsp;\r\n\r\n[caption id=\"attachment_100\" align=\"aligncenter\" width=\"194\"]<img class=\"wp-image-100 size-full\" src=\"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-content\/uploads\/sites\/1349\/2021\/03\/DPST.png\" alt=\"\" width=\"194\" height=\"138\" \/> Schematic symbol for a double-pole, single-throw switch[\/caption]\r\n\r\nThe schematic symbol for a <strong>DPST<\/strong> switch has a dotted line connecting the two movable switch components signifying a \"mechanical interlock\", meaning that when one switch moves, the other moves with it. this ensures that operating the external handles will either connect or disconnect both line conductors.\r\n\r\nThese types of switches are often used to control electric heating loads and have a temperature sensing component to allow them to automatically open or close the contacts with a change in external temperature. When used for this purpose we refer to these switches as thermostats.\r\n\r\n&nbsp;","rendered":"<p>This switch looks like a standard <strong>SPST<\/strong> switch from the outside but inside, instead of interrupting only one current-carrying conductor, it interrupts two. This makes it suitable for controlling and isolating loads that utilize two <strong>ungrounded<\/strong> conductors and operate at 240V single-phase.<\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_100\" aria-describedby=\"caption-attachment-100\" style=\"width: 194px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-100 size-full\" src=\"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-content\/uploads\/sites\/1349\/2021\/03\/DPST.png\" alt=\"\" width=\"194\" height=\"138\" srcset=\"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-content\/uploads\/sites\/1349\/2021\/03\/DPST.png 194w, https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-content\/uploads\/sites\/1349\/2021\/03\/DPST-65x46.png 65w\" sizes=\"auto, (max-width: 194px) 100vw, 194px\" \/><figcaption id=\"caption-attachment-100\" class=\"wp-caption-text\">Schematic symbol for a double-pole, single-throw switch<\/figcaption><\/figure>\n<p>The schematic symbol for a <strong>DPST<\/strong> switch has a dotted line connecting the two movable switch components signifying a &#8220;mechanical interlock&#8221;, meaning that when one switch moves, the other moves with it. this ensures that operating the external handles will either connect or disconnect both line conductors.<\/p>\n<p>These types of switches are often used to control electric heating loads and have a temperature sensing component to allow them to automatically open or close the contacts with a change in external temperature. When used for this purpose we refer to these switches as thermostats.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"author":103,"menu_order":4,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":["alee59"],"pb_section_license":"all-rights-reserved"},"chapter-type":[],"contributor":[61],"license":[58],"class_list":["post-101","chapter","type-chapter","status-publish","hentry","contributor-alee59","license-all-rights-reserved"],"part":85,"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters\/101","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/users\/103"}],"version-history":[{"count":2,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters\/101\/revisions"}],"predecessor-version":[{"id":347,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters\/101\/revisions\/347"}],"part":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/parts\/85"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapters\/101\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/media?parent=101"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/pressbooks\/v2\/chapter-type?post=101"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/contributor?post=101"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/lightingforelectricians\/wp-json\/wp\/v2\/license?post=101"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}