[Amps] 130 V MOV placement ??

Jim Thomson jim.thom at telus.net
Fri Sep 21 15:23:18 EDT 2018


IF  using a 130 V rated   MOV,   where  does it get wired ?   Do you wire between  120 vac  and neutral.... or  120 vac and chassis of  equipment in  question ?   

IF  a spike  / transient /  glitch  etc  occurs.and  MOV  conducts..which  path do you want the fault current to flow through, the ground wire or the  neutral ?   

The only place the  neutral and ground are bonded together is at the main 200A panel.   On my 100 A  sub panel, the neutral + ground are NOT bonded,  per the electrical code. 

Either way, the  MOV  is fused, so if it does fail  shorted... the fuse opens up.   Also  I use a neon  /  led  wired between output of fuse..which is also the input to the MOV...and neutral. 
In normal operation, the  neon / led is illuminated.    IF fuse opens  up, the  neon / led  goes  out.... telling me the MOV is doa. 

Tnx... Jim   VE7RF


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