[Amps] 130 V MOV placement ??

[c miller]

Well, if a MOV is only available best placement is line to neutral thus protecting the powered equipment from basic power line differential spikes.  To achieve better protection three MOVs are to me used in a line to line and line to ground configuration thus clamping all spikes to rated values at the equipment.  This catches any common mode events that could occur on any pair of lines.  Got to watch them long lightning antennae that exist in the structure.😄

Chris
VE3CEA



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Friday, September 21, 2018, 15:23 -0400 from Jim Thomson <jim.thom at telus.net>:
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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