This article describes the immediate safety steps needed in a building where solid conductor aluminum electrical wiring is installed. This article describes the acceptable methods to repair aluminum wiring, including which aluminum wire connectors to use for safest results. We describe how to make aluminum to copper pigtail connections using the COPALUM connector or the AlumiConn™ connector as well as how to make aluminum-to-aluminum wire connections and aluminum ground wire connections.
How to reduce the risks associated with aluminum electrical wiring - a practical guide shows which aluminum wiring connectors can be used successfully to connect aluminum conductor wires to copper-wired devices (such as lighting fixtures or fans) and to electrical receptacles ("plugs") or to light switches. Notes on using the COPALUM connector for aluminum wire repairs - aluminum to copper pigtailing. Notes on using the AlumiConn™ connector for aluminum wire repairs - aluminum to copper pigtailing & aluminum to aluminum wire splices - where to buy and how to install and torque the AlumiConn aluminum wire repair connector. How to splice aluminum-to-aluminum electrical wires.
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HOW TO REDUCE THE RISK of Fire and Electrical Circuit Connector Overheating in buildings with Aluminum Electrical Wiring
The page top photograph shows an infra-red photo of an overheating aluminum wiring connection at an improper aluminum-to-copper "pigtail" splice (courtesy of G. Cohen). Aluminum wire connections can overheat enough to start a fire without ever drawing enough current to trip a circuit breaker, and improper repairs can increase the hazard.
Immediate Actions for Safety of Aluminum Wiring
Once the initial steps above have been addressed here are the US CPSC recommended choices for safe repair of aluminum wiring:
Aluminum Wiring Repair Method No. 1: Re-wire the Building, Replacing All Aluminum with Copper Wire
Re-wire the Building replacing all aluminum branch circuit wiring with copper, as a "best repair method" for aluminum wiring. However this approach will be the most costly method for aluminum wire repair, requiring snaking new wires throughout the building.
New copper wires are run throughout the building, from the electrical panel to junction boxes, receptacle boxes and to connected devices such as electrical switches, receptacles (outlets or "wall plugs"), etc.
The old aluminum electrical conductors can be left in place in building walls and ceilings, and will be harmless once those wires are completely disconnected from the electrical system.
The re-wire approach to aluminum wiring repair is used principally when other building renovations that require opening building walls, ceilings, floors, make this method practical.
COPALUM Copper-to-Aluminum Pigtailing Use the special AMP (now TYCO) COPALUM connector and special tool to
connect short copper wires to every aluminum wire end in the Building, reconnecting the copper to the
various devices (outlets, switches, lights) and splices.
How to Become a Certified COPALUM Installer for Aluminum Wiring Repairs
The following material is based on information from Tyco Electronics, supplier of the COPALUM connector and crimping tool used for aluminum wiring repair:
See Tyco Electronics for details about COPALUM certification, crimping tool leasing, supplies, training. Terms and conditions of leasing the COPALUM retermination tool (crimping tool) for aluminum wire repairs includes requiring that the contractor be properly trained in use of the equipment.
Tyco COPALUM Part Numbers
Shortcomings of the COPALUM Aluminum Wiring Repair Method
Space limitations in the junction box or receptacle box: These connectors and the copper pigtail wires take up more space in a junction box or receptacle box than the original wires and connectors. At ALUMINUM WIRE REPAIR SPLICE SPACE we discuss options for fitting the COPALUM connector and pigtail wires into electrical boxes where space is tight.
OPINION: Problem for Large Electrical Contractors repairing aluminum wiring: Tyco should make the COPALUM crimping tool available for sale: Unfortunately, Tyco's "rent-only" option for the COPALUM connector makes aluminum wiring repair service prohibitively expensive for large electrical repair companies who are performing extensive aluminum repair work in large urban areas.
Placing multiple repair tools in multiple repair service trucks with aluminum-wire repair-trained experts, and keeping them there year in and year out in order to be responsive to consumer needs prices this service right out of that market place and has tempted some aluminum repair electricians to make use of alternative repair methods that appear to work (the AlumiConn discussed below) and other aluminum repair methods that have been shown to be ineffective and dangerous.
OPINION: Problem for Small Electrical Contractors repairing aluminum wiring:Tyco should make the COPALUM crimping tool available for short term rental: A small electrical contractor wanting to become trained, certified, and qualified to perform a small number of aluminum wire repairs faces a different problem. Tyco rents the COPALUM crimping tool for a three-month minimum, converting to a month-to-month lease thereafter. This will not be economical for a small contractor performing only occasional aluminum wiring repairs.
Results of independent testing indicate that this product "... is predicted to have a high probability of failure-free long-term safe performance, PROVIDED THAT THE SETSCREWS ARE CAREFULLY TIGHTENED TO THE MANUFACTURER'S RECOMMENDATION".
AlumiConn TM Purple #95135 aluminum to copper lug connectors [New in 2006, now U.L. Listed, 2007 completed independent testing] available from King Innovation. The AlumiConn connector is now recommended for aluminum wiring repairs - US CPSC.
The AlumiConn™ connector shown here is used to splice a copper "pigtail" wire together with one or two aluminum wires as a step in reducing the fire hazard associated with aluminum electrical wiring. This connector performs well provided that the wires are properly secured in the connector, and it has been included in the US CPSC recommendations for aluminum wiring repair.
Reference: details of the study and recommendations are on page #6 (the 9th page in the .pdf file) in Dr. J.A. Aronstein's .pdf document version of "Reducing the Fire Hazards in Aluminum Wired Homes" May 21, 2007. The test results are completed and will be published in September 2007. (100 connectors cost $285. Lower prices for larger quantities.)
Alumi-Conn where to buy, how to install:
Installation instructions for AlumiConn™ for aluminum wiring repair
Question: Is it OK to Use the AlumiConn™ by King Innovation for Aluminum Wiring Repair
In the section regarding aluminum wiring repair it is not clear to me if the product called Alumiconn by King Innovation is a safe and acceptable alternative to Copalum. I have not been able to find anywhere in the internet any further references to how safe is this product beyond the publication by J. Aronstein last update July 6, 2007. Can you clarify this for me? - J. C., Orlando, FL
[Note: this question and answer was posed in 2009 but has been updated to reflect the 2011 US CPSC recommendations concerning the AlumiConn connector - Ed.]
Answer: Yes, properly installed this is an approved repair for aluminum wiring.
Safety/Usability of the AlumiConn™: 4 Points of Discussion
1. Independent tests showed that IF the Alumiconn connector is properly installed (including torquing to the proper torque setting) it performs as well as COPALUM. We have absolute confidence in Dr. Aronstein in this matter - he is fully qualified, experienced, and is an unbiased independent party with no financial connection to the company selling Alumiconn (nor to any one else selling other products).
Here is Aronstein's paper on the topic: Reducing the Fire Hazards in Aluminum-Wired Homes - 5/21/07, (AlumiConn™ info is on p. 9)
The Alumiconn™ is UL listed (UL 486C) as a "pressure type screw connector" (USA) and CSA approved (Canada) for aluminum wiring repairs.
For general information about that listing type, see this UL connector information on the UL listing for wire connectors.
2. U.S. CPSC: This connector performs well provided that the wires are properly secured in the connector, and it has been included in the US CPSC recommendations for aluminum wiring repair as of approximately June 2011.
3. Torque settings for the AlumiConn™: Reading the UL document we see no mention whatsoever of torque specifications - those are particularly important for this particular connector as it involves tightening a screw in a terminal block to secure the aluminum or copper wire being spliced. Aronstein emphasized that the connector's acceptable performance relied on using the proper torque settings.
Torque settings are described at Technical notes on Installing or Wiring the AlumiConn™The "alternative method" described by the manufacturer for tightening the screws produces torque close to or exceeding the actual torque specified numbers (according to some preliminary tests we have done in our lab) - photo at left.4. UL listing vs CPSC Recommended: So if you were working for someone else and wanted to install only the CPSC-recommended connectors, you'd use only the AMP/TYCO COPALUM™ method or the AlumiConn™.In March 2010, prior to the CPSC recommendation of AlumiConn™ connectors for aluminum wiring repairs, we (DJF) presented this information for a group of 50 licensed electricians at an Aluminum Wiring Repair Methods Update - class in Dallas TX. These were trained licensed electricians who are informed and conservative in their practice. The company's position was that they would not use an connector that was not CPSC-recommended, notwithstanding its UL listing. Indeed, some products carrying a UL listing for aluminum wiring repair have been shown to perform very poorly in the field, such as CU/AL devices and the Ideal65 purple "Twister" connector sold for that purpose.
Aluminum to aluminum wire splices also need to be repaired in an aluminum-wired home. These splice connections are typically found in junction boxes (shown below) but may also occur in some receptacle boxes where a device such as a light or electrical receptacle are also wired.Traditionally these splices were made with twist-on connectors - an approach shown below (left) and one that is unsafe (below right) because of the risk of overheating and a potential for fire.Our photograph at above left shows aluminum wire spliced to aluminum wire at a connection which had not overheated when we took this photo.The photograph at left severe overheating and burn-up of an aluminum to copper splice made using a conventional twist-on connector.
Avoid Using Copper Pigtails When Splicing Multiple Aluminum Wires Together
The various "copper pigtailing" methods discussed in articles on aluminum wire repairs (at aluminum-wired devices such as electrical receptacles, switches, and lights) are not the best approach when repairing aluminum-to-aluminum wire splices such as at a junction box in a building (where several aluminum-wire circuits or wires are joined together).
Which Connectors Are Used for Splicing Aluminum Branch Circuit Wires
For the aluminum wire to aluminum wire connector case, use of a splicing connector whose manufacturer specifies that the connector must be used with a combination of copper and aluminum wires together (the COPALUM) makes little sense.
Our photo left shows three aluminum wires connected together (spliced) into an AlumiConnTM device.
For the small aluminum wire sizes such as found in building branch circuit wiring for lighting and receptacles, the AlumiConnTM is probably the best choice if the COPALUM connectors and special crimping tool are not readily available.
The installation instructions for the AlumiConnTM (AlumiConn INSTALLATION PROCEDURE) indicate that the connector can be used for splicing solid conductor aluminum branch circuit wires in sizes #12 - #10.
For larger aluminum wire sizes sizes (stranded aluminum wiring such as found at air conditioning compressor circuits, electric range circuits, clothes dryer circuits and other high-amp devices), any of the (UL listed for Aluminum) setscrew type connectors in combination with the inhibitor/abrasion installation technique should suffice.Since we've seen frequent field reports of overheating at multi-strand high-amp aluminum wired devices such as air conditioning compressors, it is important to address these cases by proper repair methods.
[Note: some air conditioning equipment manufacturers currently recommend use of only
copper wiring to feed their equipment - DJF June 2007]
Other aluminum wiring repair connector products
have been sold by various manufacturers, some with good performance and some unacceptable. Descriptions are below. Emergency temporary repairs necessary to keep an essential circuit in service might be possible following other procedures described by the CPSC or by industry experts.Details about other aluminum wire repair methods that are not recommended are found at
Other methods - also not recommended: include attempts to repair aluminum wiring using receptacles and outlets marked "COALR" (even if these worked, which has not been demonstrated, what about all of the other electrical connections and splices in the building?). COALR and CU/AL devices as a "repair" for aluminum wiring is discussed at ALUMINUM WIRING REPAIR, Other Products.
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