Load Analysis Layout

I have a 277/480 service with a 120/208 load in a restaraunt I am building. The a/c's (3) and vent hood are 480v. Layin lighting 277v. All other load will be gas or 120v. I understand the calculations fine, but I am not sure how to layout the written load analysis, because of the dual voltages. Can

Star Delta Motor Running Trouble

when the 55 kw motor converts from star to delta it trips. But the contactor is latched on. so we started the motor in delta. it runs. when we reverted back to normal star delta fashion the same thing happened. when the timer and OLR were changed, the star contactor was on, but not the main contacto

Noise Reduction for AV installation

An AV consultant on one of our projects has requested a separete isolation transformer to power all his rack and room mounted equipment. This is a 8 story building and the equipment is scatttered trhoughout the facilty. We are using a 600 Volt distribution system that uses ZigZag transfomers at each

Sizing of Drop Out Fuse

I have a 100kVA 11kV/0.4kV Dyn11 type transformer. I want to connect a 20kW HydroPower plant to this 11 kV grid with this transformer. So, how can I calculate the size of Drop out fuse to connect HV side transformer to 11 kV grid? Or shoud I use MCCB??

The Recipe for CEO Success

What are the key characteristics of a successful CEO heading an innovative company? Machine Design editor Leland Teschler describes wish list, which includes overconfidence (characterized by how CEOs manage their stock options), and an "unwavering resolve and workmanlike diligence" for getting work

Too Old to Hire?

Despite laws against discrimination on the basis of age, older workers, those 50 plus, say they have the biggest disadvantage when seeking a job. In fact, employment counselors suggest that age may be the most common form of workplace discrimination. Why do think employers are so reluctant to hire o

More Transparent OLEDs For Phones

See-through OLED panels can be made by either keeping the emitter and driver layers very thin, or by leaving areas empty except for a see-through substrate. A 2-inch 320 x 240 (QVGA) OLED panel, deposited on glass, let more than 50% of the light through. They seem destined for phones — but why

Motor Theory

hi can anyone give me a help with this question please?

i need to find starting voltage of the motor, the percentage of normal torque when the motor is started the motor start current and supply current.

i thnk the point of the exercise is to bring home the point that that trfx for st