The NEC allows replacing non-grounding-type (2-prong) receptacles with grounding-type (3-prong) receptacles by adding GFCI protection at the breaker or first outlet.
What reasons might there be for wanting to upgrade the circuit wiring to include an equipment grounding conductor (EGC) instead of, or in addition to, adding GFCI protection? (alluded to in this answer)
Specifically, I'm curious about:
- Safety - In what scenarios does an EGC provide protection (from electric shock, fires, etc.) where a GFCI does not?
- Can an EGC help prevent damage to computer or audio equipement?
- Could an EGC reduce noise/static from audio equipment?