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2. Electrical outlet tester - Wikipedia

   en.wikipedia.org/wiki/Electrical_outlet_tester

   A receptacle tester being used to check for some types of improper wiring of an outlet. For this particular tester, proper wiring is indicated by the two yellow lights. The outlet tester checks that each contact in the outlet appears to be connected to the correct wire in the building's electrical wiring. It can identify several common wiring ...

3. Electrical wiring in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_the...

   Any AC transformer supplying such a device must be located outside zones 0–2. Since the introduction of the 17th edition of the IET Wiring Regulations in 2008, 230 V fixtures such as light fittings and extractor fans are permitted in zones 1 and 2, subject to those fixtures meeting the appropriate ingress protection ratings. [22]

4. Bi-pin lamp base - Wikipedia

   en.wikipedia.org/wiki/Bi-pin_lamp_base

   The suffix after the G indicates the pin spread; the G dates to the use of Glass for the original bulbs. GU usually also indicates that the lamp provides a mechanism for physical support by the luminaire: in some cases, each pin has a short section of larger diameter at the end (sometimes described as a "peg" rather than a "pin" [2]); the socket allows the bulb to lock into place by twisting ...