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Any cable installed underground can be assumed wet. In conduit or direct buried it's going to be wet sooner or later. If it's not rated for wet locations assume trouble.

If there is not a fire and a power outage your main fire pump is going to start every time the system leaks down a little. Your going to wear out the fire pump system by starting the whole system.

It's not so much the "blast" as the fire. Once the tank is ruptured keep the fire from spreading, control the oil. Look up Transformer fire walls, Oil containment and control systems and deluge systems. Look at the USACE and BuREC standards.

Water in the interior of a power cable is rare but it happens. Unless the cable is cut and water runs out like it was a garden hose you may never know. At least two cable manufactures and two utilities have procedures for removing water. They all involve purging the cable with dry air or...

Are there any bulges in the sides or back? Is the core of the cable filled> If the door is big enough you don't need much pressure to blow it off. Water in the cable and a high load ( for what ever reason) could generate enough "steam" pressure to push a door off.

How tight was the box? Smaller "Explosion proof" fittings usually have vents and drains.

It's a plane to hire someone ( usually an individual they already know). it's not uncommon to list specific classes the individual has taken and/or experience on some obscure software. When online adds weren't so common there were adds in magazines like Engineering News Record ( a civil/...

How long are the HPCI and RCIC turbines in BWRs supposed to run? what was the test that caused the Cherynobil accident supposed to find out. That was a main generator test on residual heat?[/indent]

Look up MSHA. They cover mines. You not digging a mine but a fire is a fire. I am sure they cover combustible material, lighting, communication and breathing devices.

I have had one case where a 120 volt AC relay worked on 24V DC. That was for a short time. The problem was when power was removed and the relay was supposed to have opened. It didn't, The Iron path had permanently magnetize. 125 and 250 volt DC relays have springs like bear traps and many...

https://www.youtube.com/watch?v=FTzrfOJkKk0 Several Youtube videos of this fire. Black smoke very noticeable where gray skys are common. BPA seems t have a lot of transformer fires.

"Structural engineer will very likely omit this factor" Not in my experience.

I don't remember the details but at the pumping plant was being built each vendor was to supply a pump for testing. The testing facility was in Scotland. The story was that a fraction of a percent in efficiency would be be very expensive over the life of the project. LAPWD also proposed a...

John Baker At the end of the California Aquaduct is a 1,120,000 HP pumping station. There is at least 1 hydro plant on the downhill side.

No one can answer your question without seeing the complete control schematic. There may be two- The one that's on the drawing(S) and what actually exist. I would suggest verifying the drawings first. Have a verified "As built" drawing. Verify the working operation of all components. All...

You tube has lectures on everthing. https://www.youtube.com/watch?v=oYj7j5QBlY0 Nothing to do with this but Gilbert Strangs math lectures are great. https://www.youtube.com/watch?v=oYj7j5QBlY0

Sounds like the motor is working to hard. Does the machine have the correct fan? Does the fan have adjustable inlet or outlet campers? IS it direct or a belt drive? If so are the drive pulleys correctly sized?

Edith Clarke's books are on google books.

In the late 19th and Early 2oth century people worked many more hours a week than they do now. Productivity is now much higher and we don't need near as many people to provide the goods and services society needs. Solutions? 1.) Just let the 30-40% of the population not needed draw well fare...

Calcium? Could it be magnesium from MI cable? Both of the following have the best write up on explosion proof systems. http://www.cooperindustries.com/content/dam/public/crousehinds/resources/pdfs/other-pdfs/crouse-hinds-codedigest2014.pdf...