insulation-type fault
21Overhead power line — This article is about power lines for general transmission of electrical power. For overhead lines used to power road and rail vehicles, see Overhead lines. Transmission lines in Lund, Sweden …
22Electricity distribution — is the penultimate stage in the delivery (before retail) of electricity to end users. It is generally considered to include medium voltage (less than 50 kV) power lines, electrical substations and pole mounted transformers, low voltage (less than …
23Stage pin connector — Caution: this article discusses high and mid voltage wiring. Never work on a live circuit. If you are unsure of any electrical work consult a licensed electrician. Articles read on wikipedia do not qualify you to work on electrical equipment.A… …
24United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
25Extra-low voltage — IEC voltage range AC DC defining risk High voltage (supply system) > 1000 Vrms > 1500 V electrical arcing Low voltage (supply system) 25–1000 Vrms 60–1500 V electrical shock Extra low voltage (supply system) < 25 V …
26architecture — /ahr ki tek cheuhr/, n. 1. the profession of designing buildings, open areas, communities, and other artificial constructions and environments, usually with some regard to aesthetic effect. Architecture often includes design or selection of… …
27Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
28Harz — Mountains redirects here. For the district of the same name, see Harz (district). Harz Range Country Germany …
29Opportunity rover — (MER B) Opportunity in April 2003 Operator NASA Mission type Rover …
30Upholder/Victoria class submarine — The Upholder / Victoria class submarines, also known as the Type 2400 (due to their displacement of 2,400t), are diesel electric Fleet submarines designed in the UK in the late 1970s to supplement the Royal Navy s nuclear submarine force. In 1998 …
