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Public Address Cabling
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 299165" data-attributes="member: 250"><p>Way back in my younger days with a previous employer..</p><p></p><p>factory &amp; office PA systems were one of the services we did...</p><p></p><p>they were 100v line system with line matching transformers either built in or adjacent to each speaker..</p><p></p><p>the speakers were cabinet type ones in the offices and metal horns 8W or</p><p></p><p>re-entrant horns.. (a sort of long horn but double backed folded in on itself to make it more compact..)</p><p></p><p>In those days the cable we used was 0.85mm twin cable (No earth)</p><p></p><p>some of the cable runs were well over 100m...</p><p></p><p>sprawling out in a radial formation around the factory..</p><p></p><p>Some of these were foundry's and meal press drop forge stamping machines..</p><p></p><p>Bl00dy noisey..</p><p></p><p>Probably noisier than a grass track...</p><p></p><p>I would hazard a guess that twin 1.5mm SWA would be up to the job...</p><p></p><p>REMEMBER</p><p></p><p>the 100v is a peak voltage when the particular amplified audio hit a high...</p><p></p><p>it is not a standing voltage that is sitting on the cable 100% of the time!</p><p></p><p> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue :p" loading="lazy" data-shortname=":p" />opcorn</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 299165, member: 250"] Way back in my younger days with a previous employer.. factory & office PA systems were one of the services we did... they were 100v line system with line matching transformers either built in or adjacent to each speaker.. the speakers were cabinet type ones in the offices and metal horns 8W or re-entrant horns.. (a sort of long horn but double backed folded in on itself to make it more compact..) In those days the cable we used was 0.85mm twin cable (No earth) some of the cable runs were well over 100m... sprawling out in a radial formation around the factory.. Some of these were foundry's and meal press drop forge stamping machines.. Bl00dy noisey.. Probably noisier than a grass track... I would hazard a guess that twin 1.5mm SWA would be up to the job... REMEMBER the 100v is a peak voltage when the particular amplified audio hit a high... it is not a standing voltage that is sitting on the cable 100% of the time! :popcorn [/QUOTE]
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