NetNathan
Lifetime Supporting Member
An MOV is a surge protector....but 1 time only.
Far cheaper choice and may be what spec intended.
Far cheaper choice and may be what spec intended.
Frequently, but it shouldn't be. That's one of the reasons I said transorbs are better.An MOV is a surge protector....but 1 time only...
A $3 power strip with ten cent protector parts maybe sells for $30 or $85. When that ineffective protector fails on a first surge, then wild speculation says protectors are only a one shot device.An MOV is a surge protector....but 1 time only.
These types of Surge Protectors are considered for the benefit according to me, as they help keep signals strong.
Those tiny noise transients cause by switching must be inside, already solved, and part of the design. And using devices designed for frequent transients (ie avalanche diodes, transorbs, transil). Anything on its AC cord does nothing to protect from that noise.Service entrance surge protection does nothing to protect the panel against these types of issues.
The OP's application is for water/wastewater treatment. In a previous life, I worked for an integrator that did a lot of this type of work. In about every case, this same spec was boilerplated into the requirements. Finally figured out that this industry uses a lot of underground cabling, in a lot of wet locations, and for some reason seems to insist on 120VAC signals for every limit switch. We quit trying to fight it, especially when the spec called out Phoenix or equal. Everyone was using them; so did we.
Fortunately we live in a free market. Equipment that fails due to inferior designs does not get purchased again.Westom, I wish I lived in your fantasy world where every system was designed perfectly.