Glen Zook also offered this comment on power cords:
I do NOT agree with one of the comments on K4EEA’s website about not replacing the 2-wire cord with a 3-wire cord. NFPA NEC has required 3-wire cords on equipment such as amateur radio receivers, transmitters, and transceivers for several decades. It is a safety procedure to get the chassis grounded to the AC wiring in the building. There are several reasons for this including a definite shock hazard even if the fuse is blown.
I absolutely refuse to send out anything that I repair, align, restore, etc., with an original 2-wire cord or replacement 2-wire cord. A 3-wire cord may not be original. However, safety trumps originality every time!
Glen, K9STH Website: http://k9sth.com
I posed this question to an ARRL Field Rep at a recent Hamfest, during an RFI seminar he conducted. The answer I got was it might depend on the power distribution scheme in the rig and how the ground was incorporated. Further, it is highly recommended that any RF ground be bonded to the utility ground to prevent ground loops, i.e. differences in ground potential between the RF and utility grounds, not just for RFI considerations but to prevent a lightning strike or short from conducting through the RF ground system, and your rig, rather than the utility ground. Confusing stuff, to say the least!