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 '14 at 5:32
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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 '14 at 19:23
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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
answered Jan 11 '14 at 15:36
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@bib: Ones that, directly or indirectly, base regulations on IEC/IEEE definitions. :-) – RedGrittyBrick Jan 11 '14 at 16:57
