Mini Project Fire Alarm. A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. Thermistors serve a crucial role in temperature detection.

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

DSC Zone Wiring. Burglar alarm zones are normally closed circuits with an option to use end-of-line resistors. DSC panels come from the factory set to use resistors, so unless you change it in the program you’ll need to remember to install the 5600 ohm resistor inline with the circuit.

Where Should End of Line Resistors be Placed? An EOL resistor should always be installed at the last device in the loop and never inside the control panel. Placing resistors anywhere other than the end of the line does nothing to supervise the wiring, which is the reason for using resistors.

End of line resistors (EOLR) are resistors of a specified value that are used to terminate protective loops or zones. The purpose of EOLR’s is to allow the control panel to supervise the field wiring for open or short circuit conditions.

In the parlance of computer software, end-of-life (EOL) refers to any software program that has become outdated and, therefore, no longer supported by the manufacturer. Alternately, a computer device that cannot run newer versions of software could also be defined as an EOL product.

End of Life

In fire alarm systems, the real difference between Class B and Class A is that if the pathway is interrupted, Class B only sends a “Failure Signal” to the panel, and Class A provides an extra path to get around the interruption.

Class A wiring in a fire alarm system uses a primary signal path to all the devices, and if the signal path is interrupted, Class A wiring uses the Class A Return wires as an alternate pathway the signals. Fire alarm systems save lives and protect property. Fire alarm systems also break down because they’re electrical.

BS 7629 – 1, 300 / 500 V fire resistant electric cables with non corrosive gases and low emission of smoke when affected by fire. Category STANDARD 30 & STANDARD 60 when tested in accordance with BS EN 50200-Method of test for resistance to fire of unprotected small cables for use in emergency circuits.

Class II (with Roman numerals) refers to power supplies with either a double or reinforced insulation barrier between the input and the output. Class II supplies do not rely on an earth connection to protect against shock hazard. Many cell phone chargers and laptop power supplies are Class II.

Class 2 hitches have a 1-1/4″ receiver and generally only go up to 3,500 lbs. GTW. On the other hand, class 3 hitches have a 2″ receiver and can range up to 8,000 lbs. gross trailer weight.

Many materials are used to transmit electrical energy, but those most frequently specified for types of conductors are copper, copper-covered steel, high strength copper alloys, and aluminum.