[TowerTalk] Sparky Pays a Visit

[Steve London]

 >Remember, Polyphasers like MOVs wear out, or blow out with use.  A direct
 >hit to a bulkhead full of them can get really expensive.  MOVs are cheap but
 >you do need to get the correct ratings.  When purchasing MOVs remember your
 >line voltage Peak to Peak is 1.404 times the RMS and the MOV needs to be a
 >bit above the P to P.  If you have line voltage a bit high at 127 which does
 >happen, that's a peak to peak of just over 178 volts. Put in an MOV rated
 >under that and it'll get fried, right away.

That is true, but every MOV I see in the Mouser catalog is rated in RMS volts, 
so you can indeed choose a 130 or 150 volt MOV for your ~120 VAC power.

73,
Steve, N2IC