Instrumentation Analyzers

NEC 2017 Code Changes Chapter 4 – Equipment for General Use

ARTICLE 404 – Switches PartI.Installation404.1Scope.Theprovisionsofthisarticleapplytoallswitches,switchingdevices,andcircuitbreakersusedasswitchesoperatingat1000voltsandbelow,unlessspecificallyreferencedelsewhereinthisCodeforhighervoltages.404.2SwitchConnections.(A)Three-WayandFour-WaySwitches.Three-wayandfourwayswitchesshallbewiredsothatallswitchingisdoneonlyintheungroundedcircuitconductor.Whereinmetalracewaysormetal-armoredcables,wiringbetweenswitchesandoutletsshallbeinaccordancewith300.20(A).Exception:Switchloopsshallnotrequireagroundedconductor.(B)GroundedConductors.Switchesorcircuitbreakersshallnotdisconnectthegroundedconductorofacircuit.Exception:Aswitchorcircuitbreakershallbepermittedtodisconnectagroundedcircuitconductorwhereallcircuitconductorsaredisconnectedsimultaneously,orwherethedeviceis