There is a good possibility that the box in question is, itself, grounded but the outlets only have 2 prongs. Your name or email address: Small-scale infrastructure testing requires transparency Use small-scale tests for a cheaper alternative to expensive, duplicate test environments, but be wary of limitations, such as Especially where big V fed mono amps are used in an audio system. The induced voltage can cause ground loop hum.
20A 125V Isolated Ground Duplex Receptacle, 5-20R
Geist Rear 6-Outlet 20 Amp 19" Horizontal Rackmount 90¡ Power Strip - GoCore eCommerce
As to the type of receptacle to use, I spent the extra money and got 'surge suppression' receptacles. Any unbalance in the neutrals may induce a ground loop hum, especially if the grounding conductors back to the panel are of different lengths. High-abuse Nylon plate with Nylon screws. The water is analogous to the house wiring. BTW, went momentarily crazy this weekend and bought a Kronos Limited turntable; beautiful table!!! What is the big deal for a third wire being grounded?
The average computer system does not require it. Both the Hot, ungrounded conductor, and the neutral, the grounded conductor, of the branch circuit connects to the single pole GFCI breaker. I would imagine your electrician followed any local electrical codes that differed from NEC. If the receptacle is truly an IG receptacle NEC requires the receptacle to have an orange triangle on the front face plate. You'll end up with another hotspot or if you're lucky, they will just erode away and disconnect from each other. Since upgrading to Windows 10 my computer won't shut down properly. How far distance is the sub panel from the main electrical service panel?