Second, copper wires are straightforward to bend and place in numerous spots in the home. If a switch has a marking such as the letters 'ALR' inside a slashed circle, it signifies that the swap cannot, beneath any circumstances, be used with aluminum wiring. Because aluminum wire has a special enlargement and contraction price than copper, there can be a hazard to utilizing a copper-solely switch with aluminum home wiring.
If a change is not rated for 'Solid Copper' or 'CU-Clad,' it might have the label 'CO/ALR.' This signifies the swap is approved to be used with either copper or aluminum wiring. If your house happens to be wired with aluminum wire (not frequent), this is the kind of swap you'll need to use. There are, nevertheless, many advantages to using aluminum wiring.
Some stranded aluminum wiring continues to be utilized in houses at present for the main service entry wires and other 240 volt circuits like ranges and garments dryers. The wires put in during that interval have been of a smaller diameter. And they can't carry the electrical present that a copper wire with the same measurement can.
Aluminum is way lighter and malleable than copper and therefore, makes it simpler to work with. Being a cheaper steel, it can be more cost-effective to put in aluminum wiring as it will typically work out round half the cost of copper wiring.
But as a substitute the connection points (The places the place the wire connects to any switches, receptacles, junction bins, panels, and extra). This led to lots of manufacturers switching to the extra plentiful aluminum for their wiring and in some cases even for the manufacturing of electrical panels and breakers (which is the case with Zinsco electrical panels). The cause why many houses inbuilt that period might have aluminum wiring is that the U.S. was going by way of some severe copper shortage on the time. One of the downsides of aluminum is that it is not pretty much as good of a conductor as copper is. Technically, you will want wires with an even bigger diameter to be able to carry the identical electricity a copper wire does.
This and the increased electrical demands we now have nowadays can result in overheating of the wires making a severe electrical fireplace hazard. The major thing that is making aluminum wiring dangerous isn't necessarily the wiring itself.