Aluminum Wiring Facts and Fallacies 01

18/set/2017 05:40:35 detect-metals Contatta l'autore

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When initial utilised in branch circuit wiring, aluminum wire was not installed any differently than copper. Resulting from enhanced copper fees in the mid 1960's, aluminum wiring became extra prevalent in wiring houses. It was recognized at the time that aluminum wire needs bigger wire gauge than copper to carry precisely the same present.

As an example, a regular 15-amp circuit breaker wired with No. 14 gauge copper requires No. 12 gauge aluminum. Typical connections from electrical wire to electrical devices, also known as terminals, are often produced by wrapping the wire about the screw terminals and tightening the wire or pushing the wire via the back with the outlet. Over time, a large number of of these terminations to aluminum wire started to fail as a consequence of improper connection approaches and dissimilar metals. These connection failures generated heat beneath electrical load and resulted in overheated connections.

History of Aluminum Wire

Electrical energy is transmitted in the utility producing stations to person meters working with just about exclusively aluminum wiring. In the U.S., utilities have applied aluminum wire for more than one hundred years. It takes only one pound of aluminum to equal the current carrying capacity of two pounds of copper. The lightweight conductors enable the utility to run transmission lines with half the amount of supporting structures. The utility technique is made for aluminum conductors, and utility installers are familiar with installation procedures for the types of aluminum conductors utilized in utility applications. Before 1972, the aluminum wire was manufactured to conform to 1350 series alloy. This alloy was especially designed for energy transmission purpose. As a consequence of its mechanical properties the 1350 alloys had been not appropriate for use in branch circuitry. At this juncture in time a "new technology" of aluminum wire was developed, identified as AA-8000 series that is the existing aluminum wire utilised at present for branch circuitry, then again it really is really uncommon to locate in branch circuit wiring. This sort of wire when installed effectively might be just as protected as copper wire.

Problems with Aluminum Wires

Aluminum wires happen to be implicated in house fires in which consumers happen to be killed. Reports of fires with aluminum wiring in general show that poor workmanship led to failures. Poorly made connections were also regularly the lead to. There have been a variety of attainable reasons why these connections failed. The two core causes have been improper installation along with the distinction amongst the coefficient of expansion between aluminum wire plus the termination employed within the 1960's.

Feeder and branch circuit wiring systems were designed mainly for copper conductors. Aluminum wiring was evaluated and listed by Underwriters Laboratories for interior wiring applications in 1946; on the other hand it was not made use of heavily till 1965. At that time copper shortages and high costs produced the installation of aluminum plate branch circuit conductors a very eye-catching alternative. At the same time, steel screw became significantly more well-known than brass screws on receptacles. As aluminum wire was installed a great deal more regularly, the market discovered that alterations have been necessary to enhance the means of connecting and terminating smaller aluminum wire. Installation strategies for utility grade aluminum, or series AA- 1350 alloy were also several and workmanship was a vital element in making dependable connections.

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