Aluminum wiring was used in the
1970's for the wiring of receptacles and switches. Single stranded
branch aluminum wiring, has been implicated with fires in houses.
Aluminum does not conduct electricity as efficiently as copper and
creates more resistance and heat. The wire expands and contracts
more than copper. The problem was compounded by screw heads which
were too small at the devices. This expanding and contracting are
susceptible to working the connections loose at the receptacles
and switches. This is where a short can occur as oxidation builds
up between the aluminum wires, and pose a potential fire hazard.
Updated devices with larger screws were created however, these are
not considered the best or only solution. Some people feel the aluminum
should be removed and copper replaced. There are some approved and
accepted methods. Standard wire nuts are not approved for pig tailing
and according to the Consumer Product Safety Commission may be a
greater fire hazard and should be repaired.
Approved Methods According to the Consumer Product Safety Commission
include:
- Copper pig-tails crimped onto the aluminum at all receptacles
and switches. A special tool is used for this application.
- UL. approved wire nut connectors, filled with anti-oxidant cream,
designed specifically for aluminum to copper connections.
- Secure connections as is on approved Al/Cu devices.
- Use antioxidant on all aluminum wiring connections
Monitor conditions such as flickering lights, voltage drop, or
warm receptacles. In any case, an electrician familiar with aluminum
wiring should be consulted to verify proper connections. Multi stranded
aluminum wiring is not part of this problem and of no concern. The
majority of modern 220 amp rated houses are utilizing multi stranded
aluminum wiring.
COPPER CLAD ALUMINUM
Copper Clad Aluminum is easily mistaken for copper. It does not
have the same problem with oxidation build up as does aluminum.
It is typically a # 12 wire and still needs proper devices with
the larger screw heads or approved pig tailing methods. To identify
Copper Clad Aluminum look for a silver color at the ends of the
wires where they are connected to the grounding bar. Another location
to identify Copper Clad Aluminum is in the attic or crawlspace.
In these areas look for the identification on the wire sheathing
such as CU Clad AL.
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