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Electrical advice - old fire alarm bell
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<blockquote data-quote="Perplexed" data-source="post: 3850853" data-attributes="member: 7157"><p>The bolts labeled “A” and ”B” in the underside pic are threaded through the base plate into the two parts labeled “A” and ”B” in the topside pic. “A” contains a bolt with a point that completes the circuit with the spring steel leaf attached to the steel clapper arm, which is in turn held in place by a pair of pointed bolts (one on top, one on bottom), all of which are held in place by the bracket (labeled “B” in the topside pic) into which Bolt “B” is threaded from underneath. Originally, the leads coming off the EM’s were attached to Bolts A and B on the underside, but I found out this morning this is wrong. The wire going to Bolt B should instead go to Bolt D, which is attached to the steel base plate.</p><p></p><p>Here’s a side-by-side pic with the “new” alarm bell which came to me wired correctly; note the base plate is made of wood, hence the strip of metal connecting the post in the lower right with the steel base on which the EM’s are mounted. It’s not easily seen in the pic, but one lead from the EM’s is attached to the top of what would be “Post A” with the pointed contact, while the other lead from the EM passes over a folded piece of insulation to the strip of metal that leads to the post in the lower left corner. The layout on this second alarm bell basically has the two posts, along the lower edge, switched compared to the two posts on the black alarm bell that are mounted on the fancy tabs. I hope this makes sense!</p><p></p><p>[ATTACH=full]300085[/ATTACH]</p></blockquote><p></p>
[QUOTE="Perplexed, post: 3850853, member: 7157"] The bolts labeled “A” and ”B” in the underside pic are threaded through the base plate into the two parts labeled “A” and ”B” in the topside pic. “A” contains a bolt with a point that completes the circuit with the spring steel leaf attached to the steel clapper arm, which is in turn held in place by a pair of pointed bolts (one on top, one on bottom), all of which are held in place by the bracket (labeled “B” in the topside pic) into which Bolt “B” is threaded from underneath. Originally, the leads coming off the EM’s were attached to Bolts A and B on the underside, but I found out this morning this is wrong. The wire going to Bolt B should instead go to Bolt D, which is attached to the steel base plate. Here’s a side-by-side pic with the “new” alarm bell which came to me wired correctly; note the base plate is made of wood, hence the strip of metal connecting the post in the lower right with the steel base on which the EM’s are mounted. It’s not easily seen in the pic, but one lead from the EM’s is attached to the top of what would be “Post A” with the pointed contact, while the other lead from the EM passes over a folded piece of insulation to the strip of metal that leads to the post in the lower left corner. The layout on this second alarm bell basically has the two posts, along the lower edge, switched compared to the two posts on the black alarm bell that are mounted on the fancy tabs. I hope this makes sense! [ATTACH type="full"]300085[/ATTACH] [/QUOTE]
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