Question: (a) Sections 19-7 and 21-9 discuss conditions when and where it is especially important to have ground fault circuit interrupters (GFCIs) installed. What is it

(a) Sections 19-7 and 21-9 discuss conditions when and where it is especially important to have ground fault circuit interrupters (GFCIs) installed. What is it about those places that makes "touching ground" especially risky?
(b) Describe how a GFCI works and compare to fuses and circuit breakers (see also Section 18-6).

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