On Wednesday, November 25, 2015 at 7:09:04 PM UTC-6, wrote:
On Wed, 25 Nov 2015 12:15:14 -0800 (PST), bob_villain
wrote:

As you say, with your experience you may have used specs for isolated-ground applications. Then, the mounting tabs are insulated and there's only a dedicated ground on the receptacle.

IG is mostly snake oil. IBM dropped the requirement in the Carter
administration.

The electrical inspection department around here still requires it for data processing equipment or any computer, medical or electronic gear. ^_^

[8~{} Uncle DATA Monster