Electrical Wiring

It took me a while to find out what a star connection is. In the US we call it a Y connection. Each resistor has to dissipate 1/3 of the power, or 5000 watts. then it's just a case of using P=E2/R. or R =E2/P R = 208 x 208 / 5000 = 8.66 ohms

Power lines and phone lines though using the same utility poles are two different sets of wires. Telephone wires carry their own power, separate from the power lines and are insulted while power lines are not. If the telephone wires are unbroken but laying on the ground the wires will not short to ground while an unbroken uninsulated power line will short to ground disrupting service.

It depends upon the length. 10 gauge is rated for 30 amps to about 100 ft. However if running longer than 100 feet, you should drop down a gauge to #8.

Basically the formula is I = P / V where I = amps, P = power (kV) and V = volts for a single phase 11 kV genset the formula is 11000/400 = 27.5 amps max load. For a 3 PHASE GEN then 11000x0.8/400/3 = 7.3 amps per phase.

chiltons manual for 67 chevy at the library.

No not yet. wait ten years. There are Mobile signs in California that display your speed as you drive past.

PIR's are passive infrared detectors which operate when ever a warm body radiating in IR moves. One can set a threshold for amount of IR and hence indirectly for a given range and size of body temperature.

So its obvious that on open areas this will not work as any animal could also trigger the alarm. However this alarm could be used to trigger a camera that is being monitored. If the monitoring has to be automatic than a pattern recognition software will have to used to ensure that a zone is being or has been infiltrated.

PIR can be used more effectively in an closed room situation by coupling it with that zone is being infiltrated, that is infiltration will be from a window/door. Now a magnetic door switch can be used to detect the presence of the burglar.

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Yes, a PIR can be used for an entry/exit zone, but if you are using to protect the door as well as a room, I would recommend you lower the entry delay time to as low as possible.

The main advantage i
s that it
s cheaper. Since U do not have 2 separate windings, it'
s cheaper to manufacture. Unfortunately, it's not isolated.
AutoTransformers are used for converting USA-2-Euro voltages
and vice-versa. BUT, since one leg is common to both, U do not
have electrical isolation from primary to secondary.

The formula you are looking for is volts x amps divided by 1000.

transmitter, receiver, and a base unit.

I found this light http://www.ecolivingcentre.com.au/products-page/?product_id=23 and it is the perfect size and power for a torch we are making in graphics, the only problem is that it runs on 240 volt ac current and the torch im going to make is going to have a 12 volt dc lead acid battery, is there any way that you can make the battery work with this light

To function as a server a computer must be running as a WINDOWS based server i.e windows 2000, windows NT, windows 2k3, windows 2k8 editions of server installed on computer

the server could be Linux based as well.

onan means oil natural air natural which means the oil is natural possible thin vegi oil and the cooling is done by natural air passing

Red=right, White=left, Shield=ground

The physical equation governing voltage is V = IR, where V is voltage, I is current, and R is resistance. If V remains constant while R is increased, I or current must decrease. Increasing the resistance in a circuit is simply introducing a material that further resists or impedes the electron flow (current), thus current decreases.

A #10 copper wire with an insulation rated at 90 degree C has a rating of 30 amps. Over the distance of 12 feet, there is no appreciable voltage drop that will effect the load.

This will depend on the state that you live in. The fines are usually somewhere between $200 and $500.

Yes, I have a picture of one. It's a very nice push switch.

on line

In multi pair cable sets, for example a Cat. 5 cable, the wires of each pair are twisted to prevent mutual induction into the other cable pairs. The tighter the twist, the less amount of induction into the other cable pairs.

One email uses up 0,000287149 kwh of electricity! Please see calculation & estimations for the equation in the attached discussion.

The national electrical grid.

If this is a single-phase motor, it may or may not be reversable. If it is, there should be a wiring diagram on the motors nameplate. If it just has two wires for power and no other changeable connections, it is probably not reversable. You can also look up the model number on the manufacturers website, you may find info there.

From the nameplate on the welder you find the amperage that the welder draws at the three phase voltage that you are going to use. This amperage is used to size the phase converter. This amperage is also used to size the breaker that will feed the phase converter and wire size for the installation.