A Hand Tool For Driving Screws

a hand tool for driving screws; has a tip that fits into the head of a screw

The OTDR Plus Multitester offers multitesting capability to include single- and multimode OTDR functions as well as built-in power meter, visual fault locator and single-mode laser source. A hard drive offers mass data-storage capability. Its SmartTest function checks the launch level, selects the parameters and tests the fiber. The DualTrace function tests and displays both wavelengths on one graph. Siecor use: performs all standard electrical tests for on-car and bench troubleshooting. Locate faulty wiring, test electrical components, engine sensors, ignition and fuel systems and starting/charging system voltage.

A distribution board (or panel) is a component of an electricity supply system which divides an electrical power feed into subsidiary circuits, while providing a protective fuse or circuit breaker for each circuit, in a common enclosure. Normally, a main switch, and in recent boards, one or more Residual-current devices (RCD) or Residual Current Breakers with Overcurrent protection (RCBO), will also be incorporated. A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Unlike a fuse, which operates once and then has to be replaced, a circuit breaker can be reset (either manually or automatically) to resume normal operation. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large switchgear designed to protect high voltage circuits feeding an entire city.

An electronic symbol is a pictogram used to represent various electrical and electronic devices (such as wires, batteries, resistors, and transistors) in a drawing of an electrical or electronic circuit. These symbols can (because of remaining traditions) vary from country to country, but are today to a large extent internationally standardized. Some symbols (such as those of vacuum tubes) became virtually extinct with the development of new technologies.

An electrical junction box is a container for electrical junctions, usually intended to conceal them from sight and to some extent to eliminate tampering. It can be a small metal or plastic container, such as those intended to form part of wiring, especially in buildings; in this type of application, it may form part of an electrical conduit wiring system, or may be buried in the plaster of a wall, concealed behind an access panel or cast into concrete with only the lid showing. It may or may not include terminals etc. for joining wires. A similar container used for joining wires to electrical switches or sockets is called a pattress.

knife switch

Three pushbutton switches