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The Capstone product line appears stable and effective. The initial capital cost can be hard to swallow. What are alternative technologies and their manufacturers of lower kW (50 to 150kW) three phase power sources are on the market? The need is for grid isolated systems. Thanks!

NFPA 70E 130.3 exception no. 1 allows not performing an arc flash analysis on circuits <240 where fed by a single transformer rated <125 kVA. Is there a method to visually determine the size of a single pole mounted transformer - from the ground? What size transformers are typically used by...

For capacity reasons can two (or more) VFD outputs be tied to a common bus and then used to power a motor load greater than the rating of one VFD? Any experiences? Any manufactures doing this?

I have single 120/240V 400A service. What is the largest three phase motor that drive equipment can power?

Motor information is GE 1000HP 4000V MDL. 8313783302 Code G Type K Insulation F No. 830897 How can I determine if this motor is "suitable for variable speed control"

Hi All - I have a head scratching "conflict" between NFPA 101-2000 and DOT 192.167. We installed, use and test a natural gas fueled emergency generator and transfer switch system to satisfy NFPA 101 7.9 Emergency Lighting. Another code DOT 192.167 calls for us to block and remove the fuel...

I need to shred scrap pieces of melamine foam (strips and irregular shapes). I have a grinding disc that will shred. Basically this is a wood disc with 1/2" wires sticking out of the disc face, the disc is motor driven. The wires will "catch" the edge of the foam and rip a small piece off. I...

What is an "alternating-current adjustable voltage motors" in 430.6(C) of the National Electrical Code?

Is ther a reliable method of estimating the voltage on transmission line by direct observation? I had heard something about the number of grooves of an insulator, with each groove equivelant to so many kV....

Energy cost comparison between pneumatic or electric for diaphram style pumps? Any backup data?

How long can diesel fuel be expected to remain viable? Our maintenance does some sampling, but what is the recommended tests? This standby diesel generator tank contains 2000 gallons, and is kept full.

Hi Folks - Where are some of the environments where a UL94 V-0 rating might be required. The product is a storage battery. Why?

Regarding doors; what is "3 point panic" hardware?

What is the expectation of zinc plating preventing rust on exterior hardware? I have some hinges that are rusting after 8 months....

Perhaps this AFD model number is a blast fom the past for a few of you folks. Here are my wonderings... Can control power and drive power come from separatly derived (ie: out of phase) power sources?

I can obtain 3" thick concrete faced insulation for $0.75 a square foot. It is the t&G style. The concrete is 1/2" thick. Any thoughts if this stuff would make a good sidewalk psth? Or other thoughts if it could be used for walls of a garage?

hello - I have a new ac system to operate that is old as them dar hills. I have noticed that a seemingly large amount of water/moisture collect in a dischagre storage bottle. The HP is 25 hp, so it is on hte medium size. What features can I look at on reducing thee amount of moisture into the...

Do I need to do phasor calcs on a system ? Voltage = 204 206 209 Amps = 32 42 53 What is the power in kW? P= Pa + Pb + Pc ????

I have a building cooling water loop pump system is controlled with a VFD. The pump is 480V, 40 HP. Power is through a ATS (main/diesel). When the main fails, the VFD go down on loss of AC, the pump stops, the loop pressure drops, the diesel starts, the ATS transfers, the VFD may then...

I have a variable speed trolling motor, it's controller, and a battery. These are mounted on a boat that is docked in a river. The prop turns pretty fast in the current. Can the motor/controller (generator/controller) recharge the battery? Can the motor (generator) be used to power an...