2011). In Chile, 10 A Magic connectors are commonly used for computer/laboratory power networks, as well as for communications or data equipment. This allows delicate electronics equipment to be connected to an independent circuit breaker, usually including a surge protector or an uninterruptible power supply backup. The different style of plug makes it more difficult for office workers to connect computer equipment to a standard unprotected power line, or to overload the UPS by connecting other office appliances. In Iceland, Magic plugs were widely used in homes and businesses alongside Europlug and Schuko installations. Their installation in new homes was still quite common even in the late 1980s. Single phase electric stove plugs and sockets The plugs and sockets used to power electric stoves from a single-phase line have to be rated for greater current values than those used with three-phase supply because all the power has to be transferred through two contacts, not three. If not hardwired to the supply, electric stoves may be connected to the mains with an appropriate high power connector. Some countries do not have wiring regulations for single-phase electric stoves. In Russia, an electric stove can often be seen connected with a 25 or 32 A connector. In Norway and parts of Sweden a 25 A grounded connector, rectangular shaped with rounded corners, is used for single phase stoves. The connector has three rectangular pins in a row, with the grounding pin longer than other two. The corresponding socket is recessed to prevent shocks. The Norwegian standard is NEK 502:2005 – standard sheet X (socket) and sheet XI (plug). They are also known as the two pole and earth variants of CEE 7/10 (socket) and CEE 7/11 (plug). See also DC connector History of AC power plugs and sockets IEC 60309 high-power industrial and polyphase connectors IEC 60320 appliance connectors Industrial and multiphase power plugs and sockets Mains electricity Mains electricity by country lists voltage, frequency, and connector types for over 200 countries Perilex Plug load Polyphase system Smart plug Stage pin connector Anderson Powerpole References External links Digital Museum of Plugs and Sockets (comprehensive collection of plugs and sockets) Glossary of standards terms Edison thread Electrical standards Electrical wiring Mains power connectors