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I have a general lighting question regarding our medium-pressure, mercury vapor lamps that are used for our water disinfection process. Do lamps such as these have a shelf-life? I've recieved both "yes" and "no" answers so I'm hoping to clear the air. Can you reference a source of discussion on...

Thanks for your response. It certainly makes sense and I will take your words of caution.

I would like to determine a safety factor for equipment failures that would be valuable in making decisions. One very important aspect, is the exposure time. My example, is electrical equipment failure that is in a remote area. Operators walk by the area say once/day for 10 min. How can I...

Do any one know what the code requirements are, if any, for a transformer overpressure and high temperature protection? We were accessing the top of our transformer and found separtely the pressure and temperature sensor leads are not going back to the upstream breaker trip. Is this a nice to...

A legal question for any of your Code guys out there. Consider if there were an injury during electrical maintenance and the big question was if there was neglect on maintaining electrical equipment. Where would the Lawyers and Judge lean to - NETA or NFPA as a source of reference? I beleve the...

There are many assumptions with my question so please correct me on any. We have a dozen of old and new standby power gererators in our infrastructure facilties. Monthly plant load tests are done for ~ 1/2 hr to 1 hr. Most of these diesel engines see from 10 - 25% load. Full load tests are...

My company has critical emergency diesel generators stationed throughout its infrastructure. We are looking for some expertise in modifying or replacing a temperature switch located on these engines that is exposed directly to the cooling system water. This switch sends a signal to the engine...