Electrical Notes and Articles
Thursday, November 10, 2011
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Introduction Transformer voltage drop is important to know since it is one of the factors that affect the performance of an electrical... -
Schedule of load preparation is essential and a basic calculation for electrical engineers. In this process the proper sizing of condu... -
1. Thinking that it's "only 120 volts" or 208 volts or 480 volts or... "It's only low voltage." O... -
Multiple Earthed Neutral Earthing System Defined Aus/NZ 3000 (known as Australian/New Zealand Wiring Rules) defined Multiple Earthed Neut... -
Application and arrangements of SELV and PELV circuits 1. SELV - Definition according to BS 7671 SELV - Safety (Separated) Extr... -
I. Protection against Direct Contact BS 7671 Provides 1. Insulation of live parts The insulation is intended to prevent any c... -
Source: City and Guilds Reason for earth electrode resistance testing The purpose of this test is to establish that the resistanc... -
What is polarity testing? Polarity testing is one of the tests that are required for initial testing of the installation under IEC 6036... -
BS 7671 defines circuit breaker as A mechanical device capable of making and carrying currents under normal circuit conditions an... -
What is a Shunt Trip? A shunt trip is a device designed to switch-off the circuit breaker remotely. When energized, a shunt releas...
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