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Installation Instructions SET-SCM20-SMBW
Installation Instructions SET-SCM20-SMBW

... mounted in front of, rather than behind, activity. The SET-SCM20 sensor is designed to be mounted in a corner 2.2m high, positioned so that traffic moves towards, rather than across, the detector. Position the sensor where it does not look out of doors or windows. The mounting bracket allows the sen ...
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... Very easy to build. Start with the grounding scheme first, followed by heaters. The heater center taps, you could bring to GND or elevate it to some potential. Then build the power supply, followed by the signal circuitry. Check wiring, again and again and again. Oh yeah, please fit in 5A fuse befo ...
Aalborg Universitet Infrastructure (AMI)
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... head and the Internet-based on TCP/IP. Some tests have been done based on these to communication methods. There are also some other communication technologies used for smart meter system based smart grid, such as radio mess, power line carrier (PLC), Zigbee, 3G, GPRS and so on. In smart grid applica ...
Lightning Room education kit: Classroom activities
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... Magnets that you are familiar with are generally magnetic all the time. By winding wire around particular metals and passing a current through the wire, we can make a stronger electromagnet. Big electromagnets are used to move scrap iron in junk yards – the electromagnet is switched on to pick up th ...
Rate of change of frequency protection function
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AP5727  BIAS POWER SUPPLY FOR OLED SUB DISPLAY AND TFT-LED
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... Section 525-16 states that overcurrent protection of equipment and conductors shall be provided in accordance with Article 240. Tents and concession stands that are fed by circuit to which cords or cables are connected must have overcurrent protection that protects the cord or cable as well as equi ...
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... the desired performance and needs of the particular system. ...
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... A. Regular sinusoidal oscillations B. Narrow bursts of energy separated by periods of no signal C. A series of tones that vary between two frequencies D. A signal that contains three or more discrete tones ...
< 1 ... 918 919 920 921 922 923 924 925 926 ... 1974 >

Mains electricity



Mains electricity is the general-purpose alternating-current (AC) electric power supply. In the US, electric power is referred to by several names including household power, household electricity, house current, powerline, domestic power, wall power, line power, AC power, city power, street power, and grid power.The two principal properties of the electric power supply, voltage and frequency, differ between regions. A voltage of (nominally) 230 V and a frequency of 50 Hz is used in Europe, most of Asia, most of South America and Australia. In North America, the most common combination is 120 V and a frequency of 60 Hz. Other voltages exist, and some countries may have, for example, 230 V but 60 Hz. This is a concern to travelers, since portable appliances designed for one voltage and frequency combination may not operate or may be destroyed by another.The use of different plugs and sockets in different regions provides some protection from accidental use of appliances with incompatible voltage and frequency requirements.
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