Ny varavaran’ny afo dia mizara ho varavarana afo mihidy mahazatra ary varavarana afo misokatra. Ny varavarana afo mihidy mahazatra dia mihidy eo ambany fiantraikan’ny varavarana akaiky kokoa; Noho izany, rehefa mipoitra ny afo dia afaka misoroka ny fiparitahan’ny setroky ny afo. Ny varavarana afo misokatra amin’ny ankapobeny dia misokatra eo ambany fiantraikan’ny varavarana akaiky kokoa. Rehefa mipoitra ny afo, dia havoaka amin’ny fomba mavitrika ny switch, ary hikatona ny varavarankelin’ny afo eo ambanin’ny fiantraikan’ny varavarana manakaiky sy ny fitaovana fampifanarahana.

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