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Extending a speaker cable.
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<blockquote data-quote="Rob Timmerman" data-source="post: 146721" data-attributes="member: 172"><p>Re: Extending a speaker cable.</p><p></p><p></p><p>Junction boxes may be required by the local AHJ, and the NEC basically treats Class 1 wiring (typical for the outputs of power amplifiers) as power wiring (with certain differences involving allowable wire sizes and how conduit fill is calculated). So an appropriate splice (Listed crimps or compression connectors [wire nuts]) in a standard box is the correct way to do this. Low voltage boxes may be OK if they are listed for use with Class 1 circuits, but most that I've seen are for Class 2 circuits only. This matters, because Class 1 circuits have enough energy to pose a fire risk, while Class 2 circuits do not.</p><p></p><p>Go back and reread Articles 640 and 725 of the NEC (and chapter 3, since it is referenced by Article 725 for Class 1 wiring).</p></blockquote><p></p>
[QUOTE="Rob Timmerman, post: 146721, member: 172"] Re: Extending a speaker cable. Junction boxes may be required by the local AHJ, and the NEC basically treats Class 1 wiring (typical for the outputs of power amplifiers) as power wiring (with certain differences involving allowable wire sizes and how conduit fill is calculated). So an appropriate splice (Listed crimps or compression connectors [wire nuts]) in a standard box is the correct way to do this. Low voltage boxes may be OK if they are listed for use with Class 1 circuits, but most that I've seen are for Class 2 circuits only. This matters, because Class 1 circuits have enough energy to pose a fire risk, while Class 2 circuits do not. Go back and reread Articles 640 and 725 of the NEC (and chapter 3, since it is referenced by Article 725 for Class 1 wiring). [/QUOTE]
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