Isolated Ground on Duplex Receptacle
See NFPA NEC 210.21(B)(3) Receptacle Ratings. The NEC speaks to this via a table in the section I referenced above.
You cannot use a 20A outlet on a branch circuit rated for 15A because the 20 A outlet allows equipment drawing more than 15A to be connected the branch circuit.
A 15A outlet limits the current to 12A as that is the maximum current that an appliance having a 15A plug can draw.
As a practical matter in your friend’s case it doesn’t make any difference since he is connecting low current equipment via the 20A outlet.
__________________
Main System:
Amati Futura Mains
Amati Homage VOX Center,
Proac Response 1sc Rears,
Three MC2301's for L,C,R
MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
Nottingham Dais with Wave Mechanic
Sumiko Palo Santos Presentation
SurfacePro 3, RPi 4, ROON, WW Starlight Platinum USB, Schiit Yggdrasil, Benchmark DAC3 HGC
MX 151, OppO BDP-95, JVC RS-500 DILA projector, 106" diagonal Stewart Luxus Screenwall Deluxe with Studiotek 130 G3 material.
Lake House:
Ohm F, MC 275V, C2300, MR 77, Rega P3
OnDeck:
McIntosh MAC 4300v
Last edited by W9TR; 09-26-2020 at 10:33 AM.
|