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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