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AaaRRggghhh....My apologies MintJulep (sometimes you have to club me in the head 2, 3, 4.. times). I got 20 feet per second stuck in my head when doing the calculation instead of feet per minute. Ok, everybody on the boards give one more shake of the head.

Not really needing an algebra check (other than not being able to type the correct units). Agreed that 20 ft/sec isn't that fast, but I guess that depends on what you base fast on. Still for this situation, an "amount" of air will move through the building in less than a second. Once the...

All, I was hoping to have a discussion / direction on applying q=1.08 CFM delta T. I have a pump room that is 10' high, 13.3' wide and 14.8' long. Equipment is providing heat gain to the space of 52,480 Btu/hr and I am using a wall exhaust fan and intake louver. I have traditional designed...

I am trying to find out if there is any specific standard pertaining to the air conditioning and/or ventilation requirements for mcc (electrical) rooms and hyraulic rooms. What is the standard? Where do I find it? etc.... thanks john1

What is (or is there a) standard ventilation requirement for mcc (electrical) and hydraulic rooms? Where can I find the specific standard? thanks john1

Hi lyledunn, They shouldn't really. How is it arranged? If its fed from a battery, sometimes the low voltage return is the same connection as earth. If thats the case then the earth return may include part of the battery current, have a look at the layout if thats the prob, then you could...

Hi Don01, (from John1) Yes you're right, I was on about various causes of ignition, and the various precautions that are often taken with this in mind. And you are of course quite correct about the energy content is the factor, not the voltage or the current. And you're right that this subject...

Hi EELV, Your question had me going for a while. It's the equipment that can be intrinsically safe, the circuit can be what it likes. The term 'intrinsically safe' is usually used in conjunction with a description of the environment where the equipment is intended for use. In some places...

Pl. communicate on following. In case of SS 304L plasma welding , is it possble to do the welding in inert atmosphere to avoid oxidation which further helps for corrosion.