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emergency power systems
emergency power systems

... The status report shall be sent to 6 user defined locations. These locations can be preprogrammed at factory, programmed on site by customer, or remotely programmed by factory once system is installed. The self/diagnostic facsimile shall allow for remote monitoring and troubleshooting of any abnorma ...
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... Random data has a 50% chance any bit changes from one cycle to the next. Some applications may be able to predict this chance using some prior information about the data set. If there is an ability to predict bit changes, the application-specific probability can be used. All other applications shoul ...
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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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