[Amps] MOVs

[Jim Brown]

On 1/23/2014 10:02 AM, Carl wrote:
> Inductive industrial equipment use big MOV's for spike suppression on 
> single and 3 phase lines of many voltages.

Again, the problem comes with interconnected equipment when the MOV 
dumps the spike onto ground. Won't repeat previous email. :)

>
> I use a pair of large Littlefuse MOV's as a whole house limiter and 
> right at the main panel.

That's an excellent application.

> Lines that are used with electronics when on generator power are also 
> treated with MOV's and .01/2KV buffer rated disc caps. 

Some things that are common practice are bad practice. Like "The Pin One 
Problem" -- cable shields that go to a circuit board rather than to the 
shielding enclosure. Like power cords whose green wire goes to the 
mounting lug of a terminal strip that is insulated from the chassis by 
paint.  I'm sure you can cite plenty more examples. :)

73, Jim K9YC