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I apologize for the lack of information, but I am the only electrical engineer in the company. This info was passed down to me from civil engineers and most of this was handled by other firms in the past. I have been told that the motor repair shops say that the cause is lightning surges. We...

Anybody know what a typical 300HP IEEE 841 motor costs?

I appreciate your comments. They've been helpful. We use vertical motors. The motors usually fail from insulation breakdown. We used to spec WP1 enclosures and Insulife 2000 insulation with US Motors (two dips and bakes). For the past few motors I have been going to TEFC thinking that...

In addition to the information I posted, I'm looking at a typical 300HP 3-phase, squirrel cage induction motors. My motors range from 1/4HP-350HP.

I'm a recent graduate and I specify well pump motors in new water plants along with replacements after they fail. My company in past few years is having numerous problems with the well motors failing within 5 years, while in the past the motors could last up to 25 years. The motors are used...