The earliest form of electrical wiring system in buildings in the U.S. was knob and tube: separate hot and neutral wires were hung in air, spaced 2 1/2" or more apart, and insulated from contact with wood framing by ceramic knobs or where wire had to pass through a wood framing member, ceramic tubes. Discussion in 'Electricians' Talk' started by chrisrolfe, Oct 9, 2013. It lets you transfer the same amount of power with less wiring, in some cases 50% less (using 3 wires instead of 6). Anyone who has traveled to the United Kingdom has probably marveled at the imperial bulk of the standard U.K. wall plug. Prior to 2006, different colours of cables were used in UK domestic electrical wiring and appliances for the neutral and live wires. Neutral wire becomes live. The common "B" pipe in this arrangement is the "neutral". The guide below is for UK (British) electrical wiring, if you live in another country, the colours may be different. What were the old UK electrical wiring colours? Such is the case with a lighting circuit where there are fixtures with standard incandescent light bulbs. The Old System. Green/yellow – earth (sometimes bare wire without a sleeve) Prior to “harmonisation” with other European countries, the United Kingdom’s electrical wiring system used: Red – live. In 2006, Amendment 2 of 17 th Edition BS7671 Wiring Regulations saw a change to “harmonise” the UK colours with the European cable colours for consistency and to avoid confusion. Standard line voltage […] The only downside is that presence of a neutral may encourage the … Please explain why your asking. A neutral wire is a type of wire in which carries currents back to the source of power and or regular voltage. In order for it to work you need three synchronized power sources (the three “phases”, usually called X, Y and Z) shifted by ⅓ cycle. Page 1 of 2 1 2 Next > chrisrolfe New Member. Whilst plastering they took by … The wire had become so hot it had actually melted into the casing. Understanding the Neutral Electrical Wire. If I recall correctly, the 3 wire system that allowed the neutral and equipment ground to be one conductor, for appliance branch circuits and panels, was removed in the 2005 edition of the NEC. Since most Insteon-compatible wall switches and dimmers require a neutral wire connection to operate, you need to know if you have one of these in place. New vs Old Wiring Colours. The old colours were: Black; This was the neutral wire. The standard wiring colours in the UK are (as of 2006) the same as elsewhere in Europe and follow international standard IEC 60446. Hi There I have recently had some work down, where a wall was knocked down and we had some plastering done. Before you start working with line voltage in your electronic circuits, you need to understand a few details about how most residential and commercial buildings are wired. Black – neutral. When I checked inside the unit I saw that the neutral wire was burned out along with the adjoining section of the connector block. Essentially, it allows power to … In fact I consider that providing a neutral at switch positions is a good idea for the reasons described, but unless it becomes a regulatory requirement I doubt that it will become popular. I'd like to know why this might have happened, after it had been running fine for so long. Daniel, depending on the circuit wiring and the circuit components, it is common to get a 120 volt reading on a neutral wire that is tested to ground. Red; This was the live wire. The following description applies only to the United States; if you’re in a different country, you’ll need to determine the standards for your country’s wiring. Talk ' started by chrisrolfe, Oct 9, 2013 for the neutral and live wires like know. By chrisrolfe, Oct 9, 2013 of 2 1 2 Next > chrisrolfe New Member along with the section... 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