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2. Surge protector - Wikipedia

   en.wikipedia.org/wiki/Surge_protector

   Surge Protection Device (SPD) for installation in a low-voltage distribution board. A surge protector (or spike suppressor, surge suppressor, surge diverter, [1] surge protection device (SPD), transient voltage suppressor (TVS) or transient voltage surge suppressor (TVSS)) is an appliance or device intended to protect electrical devices in alternating current (AC) circuits from voltage spikes ...

3. BS 7671 - Wikipedia

   en.wikipedia.org/wiki/BS_7671

   The three-phase phase colours are brown, black and grey instead of red, yellow and blue. Where a circuit includes a neutral or mid-point conductor identified by colour, the colour used shall be blue. In all installations the earth or protective conductor will remain green-and-yellow.

4. Industrial and multiphase power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/Industrial_and_multiphase...

   The maximum voltage rating of IEC 60309 connectors is 1000 V DC or AC; the maximum current rating is 800 A; and the maximum frequency 500 Hz. Plugs are available in P+N+E (unbalanced single phase with neutral), 2P+E (balanced single phase), 3P+E (3 phase without neutral), and 3P+N+E (three phase with neutral).

5. Power system protection - Wikipedia

   en.wikipedia.org/wiki/Power_system_protection

   Power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults [citation needed] through the disconnection of faulted parts from the rest of the electrical network. The objective of a protection scheme is to keep the power system stable by isolating only the components ...

6. Electrical wiring in the United Kingdom - Wikipedia

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

   Surge protection device (SPD) A transient overcurrent or overvoltage protection device; safely diverts away very short-lived spikes of current or voltage. Type 1 devices provide protection from direct lightning strikes to vulnerable structures (those having a conductive structure, a lightning rod, or an overhead power supply).

7. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   NEMA L19 series devices are three-pole, four-wire, non-grounding devices for three-phase 277/480-volt devices. Designs exist for 20-ampere (L19-20), and 30-ampere (L19-30) devices, and L19-20 and L19-30 devices were commercially available from at least one manufacturer (Bryant Electric).