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==Disadvantages==
*Even though many are tested by an independent lab to a UL standard, they do not carry the UL Listing mark.<ref>{{Cite web|url=http://www.nooutage.com/interlock_kits.htm|title=Panel Interlock Kit Kits - for safely connecting generator power without a transfer switch}}</ref> Without a UL Listing, some electrical inspectors will not allow the use of these interlock kits.
*With kits installed on the [[distribution board|electrical panel's]] cover, removing the cover could allow the generator backfeed breaker to be turned on while the main is on,<ref>{{Cite web|url=https://forums.mikeholt.com/showthread.php?t=113865&page=2|title = Wire resistance, temp, soil cond}}</ref> potentially energizing [[power line]]s or overloading the generator, if the generator is connected.
*In some applications, installing an interlock kit requires drilling holes in the panel cover; once it is installed, it cannot be removed.
*Because the main breaker is shut off, homeowners have no way of knowing when utility power is restored, except by manually turning the generator's breaker off and the main breaker back on.<ref>{{Cite web|url=https://www.electriciantalk.com/f2/see-if-power-restored-interlock-kit-33891/|title = See if power is restored with interlock kit?}}</ref> However there is at least one product<ref>{{Cite web|url=http://www.nooutage.com/thp108.htm|title = THP108 PowerBACK - utility power return alert}}</ref> that will produce an audible alert indicating that utility power is restored.
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