HDMI commerical cable ratings CL2P vs CL3P

[mike s]

Does anyone know the differences between CL2P and CL3P hdmi cables?

The P indicates it's for use in plenum spaces. (ex: a plenum ceiling is typically when the space between the ceiling tiles and above slab is used as a return duct for the HVAC system, the plenum rating helps reduce toxic gases from being spread thruout the building.

[Johnnycat]

As far as I know CL@ is rated to 150V and CL3 is rated up to 300V

[mike s]

Thanks Johnnycat

BTW Here's a NEC substitution chart by Carol cable thats made by General cable.

http://www.alliedelec.com/images/Products/mkt/pb/generalcable/Pdfs/NEC_CEC_SubstitChrt.pdf

[feyz]

CL2 is for class 2 circuits, CL3 is for class 3 circuits:

http://ecmweb.com/mag/electric_understanding_nec_circuit/

[mike s]

thanks feyz,

That adds in understanding the difference between CL2 and CL3 which seems mostly related to how much voltage\power the cable can handle.

That said I still haven't seen how to determine if a hdmi Cl3 rated cable is needed or required over a CL2 rated cable, since the hdmi standard seems limited to 5.3v volts.


hdmi voltage specs in post #11 at
http://www.avforums.com/forums/sky-hd-sky-3d/365866-sky-hd-hdmi-outputting-too-high-voltage-causing-hdcp-damage.html