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120VAC needs a proper, enclosed junction box. Speaker cable, data, and low voltage power are fine with the more open low-voltage boxes. At what voltage are the enclosed boxes required? Do PoE lines (48VDC) need the same boxes as 120VAC? What's the cut-off?

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Typically communication wiring is allowed to use "low voltage" boxes, and power wiring must use closed boxes. Power over Ethernet (PoE) combines both, but I suspect would fall back to the safetiest which would be closed boxes. –  Tester101 Jan 11 at 5:32
    
If I remember correctly POE was designed to fall under low voltage most places so existing data wiring could be used. I have never seen ethernet cables used for PoE put inside an enclosed box. –  Grant Jan 11 at 19:23
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1 Answer 1

Regulations vary by country/locale.

IEC SELV is < 25 VAC or < 60 VDC.

See IEEE 802.3 POEP Study Group Safety considerations for POE and POEplus

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What locale are you reporting about? –  bib Jan 11 at 16:46
    
@bib: Ones that, directly or indirectly, base regulations on IEC/IEEE definitions. :-) –  RedGrittyBrick Jan 11 at 16:57
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