gfi needs to be on only first outlet on alternating current line...probably have more than one line ...an extra gfi in the line is good way to keep spare,,,with gfi more you pay perhaps more you get ..however..all must meet american standards which require d to be employed in damp areas...not to be negative get ones built in usa or germany where mfg. standards tend to be more regulated than possible cheaper 3rd world countries....have had gfi on all 6 independent lines...while at it consider home also bathroom , kitchen ,workshop.mine have kicked off a few times over the past years . easy reset if nothing wrong on line ..usually winter dampness if living aboard with electric heaters...
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