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This document provides opinions, conclusions, and links to public documents outlining the history of debate and research concerning use of the Ideal #65 Twister™, a twist-on connector listed by UL and marketed by Ideal Corporation as a retrofit product for aluminum wiring.

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10/04/1999 Independent Research report to IEEE Holm Conference of a study of more than 4,531 of these connectors used in 102 apartments indicates that significant field failures occurred and were attributible to the connector itself, not to installation practices nor to any unusual condition of the aluminum branch circuit wiring.

07/10/1998 CPSC Against Twist-On Aluminum Wire Connectors documents the US CPSC position on the use of twist-on connectors for aluminum wirint repairs

10/20/1997 Independent Research report to IEEE Holm Conference indicates splices using this connector are not capable of long term safe performance as part of the permanent wiring of existing aluminum-wired homes.

9/10/1997 Field failures of this device in actual service have now been reported.

3/29/1996 Independent Tests indicate Ideal-65 purple Twist-on retrofit connector fails UL 486C Safety Standard despite its UL-listing

1/311996 Ideal Corporation has indicated they're sending us additional information. 5/96 note: received, not posted. Reply contained no information except asserts no reported problems.

1/31996 Fire Hazards With Aluminum to Copper Twist-on Connectors & Acceptable Repair Practices Color Photos, Alternative Retrofit/Repair Procedures, Current Issues. From the 9/28/95 CPSC Meeting Minutes.

9/28/1995: AL-Rated Twist-On Connector Debate Continues: At a second meeting at CPSC HQ on 9/28/95, attended by the manufacturer, CPSC, UL, the author, and other professionals we learned that the manufacturer has responded to some of the CPSC concerns. That information, along with information from UL is forthcoming in the meeting log.

Ideal's marketing literature which we received and which opens with "Retrofitting Aluminum Wire Used To Be A Can of Worms"..."Not Any More!" should not be taken literally to mean that this is a general retrofit product.

At the 9/2819/95 meeting at the US CPSC in Washington, D.C., the manufacturer clarified that while their new twist-on connector has been listed under UL486C, this device is not intended for general aluminum wiring retrofit. The new connector is intended for limited special applications involving (only) certain aluminum-to-copper splices such as the addition of a new device (eg. ceiling fan) to a house wired with aluminum. The manufacturer is reviewing its marketing and instructional literature in order to clarify the intended use.

6/1/1995: Twist-on connectors (wire nuts) have not been recommended (by the CPSC) for permanent repair of aluminum wire electrical circuits. To date, this includes recently-released twist-on connectors manufactured by Ideal Industries and available in some markets. While Underwriters Laboratories has listed these new twist-on's, at a meeting with the CPSC on 1 June,1995, a number of CPSC concerns were reviewed with UL and with the device manufacturer. As a result, additional research was being performed.

6/1/1995 CPSC, UL, Ideal Corp, Meeting Log 6/1/95 documenting UL-CPSC agreements for report exchange and additional testing of twist-on connectors for aluminum retrofit

5/1/1995 CPSC Letter Aluminum Wiring Connectors letter to UL documents concerns with twist-on connectors for aluminum wire retrofit

Conclusions & Opinions

1/31/1996: Previous position: We view the CPSC and independent consultant's concerns as serious, and have some additional opinions based on field experience. The CPSC is waiting for additional information before deciding on any recommendations or actions.

We advise consumers, electricians, and building inspectors to wait for follow up information from the CPSC or other authorities before recommending this new product to their clients. Any new information we receive will be posted here promptly.

Despite some recent misunderstandings to the contrary, ASHI, the American Society of Home Inspectors does not approve nor recommend products, including this one, but does provide information for building professionals and consumers on this and other topics.

More Information - Detection, Repair, Advice for Aluminum Wiring in buildings

"Analysis of field failures of aluminum-copper pigtail splices madewith twist-on connectors", Aronstein, J.
Poughkeepsie, NY, USA; Electrical Contacts, 1999, Proceedings of the Forty-Fifth IEEE Holm Conference on
Publication Date: 1999, page(s): 87-93, Meeting Date: 10/04/1999 - 10/06/1999, Location: Pittsburgh, PA, USA
ISBN: 0-7803-5549-0, References Cited: 15, INSPEC Accession Number: 6520589
Digital Object Identifier: 10.1109/HOLM.1999.795931 Current Version Published: 2002-08-06
Available from IEEE

Abstract: A new type of twist-on splicing connector for use with aluminum and copper wire combinations was utilized to reconnect wire terminations in a group of residential apartment units. The connector differs from conventional twist-on connectors in that it is pre-filled with a corrosion inhibitor compound containing suspended particulates. Burnout occurring among these splices led to removal and replacement of all of the new connectors.

In this study, the connectors removed from 102 apartments were inspected for signs of overheating and for indications of abnormal conditions that might cause the failed connectors included samples that were applied to rated wire combinations and showed no sign of abnormal installation or application conditions.

Tests of the aluminum conductors from the apartments reveal no abnormalities that could account for the poor performance of the new connector. The inhibitor compound inside the connector was determined to be of limited effectiveness in improving the wire-to-wire contact through the high resistance film on the aluminum wire surface. On the basis of the field failures in combination with previously reported laboratory studies it is concluded that the connector is not suitable for permanent use with aluminum wire residential wiring systems

Comments: In 1997 a licensed electrician was contracted to replace all aluminum branch wiring in a 1968 residential apartment building used CO/ALR type devices to replace existing devices; the electrician "pigtailed" (aluminum spliced to copper conductor pigtails) heavily loaded branch circuits using a recently-introduced twist-on connector rated for that purpose. Independent testing (see Evaluation of a Twist-on Connector for Aluminum Wire", J. Aronstein, below) had previously demonstrated significant weaknesses of this connector. Other aluminum to copper splices using this connector involved connections to copper wire leads of lighting fixtures, HVAC equipment, and appliances.

Electrical failures were noted within the first year after these repairs had been made, detected by smell or device malfunction. Infra-red temperature measurements showed abnormal heating of other splices. By the end onf 1998 these conditions had led to replacement of all of the newly-made twist-on splices, this time using the COPALUM connector recommended by the US CPSC for this application. During replacement, additional examples of overheating were discovered.

All of the 4,531 removed connectors that had been installed in 102 apartments were retained and provided to Dr. Aronstein for further study. The results were pubished in the 1999 IEEE paper cited above. Aronstein did not find evidence of improper installation of the devices, and study of the aluminum wire itself for abnormalities (such as abnormal levels of oxide film on wire surfaces leading to higher wire-to-wire resistance in the splices) did not find that abnormal wire conditions were a factor in the failures.

These studies left the failures to be attributed to the devices themselves, by components and mechanisms within the device as Aronstein explains in detail in the paper. This article describes the field results and testing of a twist on connector produced by Ideal Industries, Ideal#65 purple "Twister"™ twist-on connector listed and sold as a repair/retrofit for residential aluminum wiring.

"Evaluation of a twist-on connector for aluminum wire", Aronstein, J., Poughkeepsie, NY, USA;
Electrical Contacts, 1997., Proceedings of the Forty-Third IEEE Holm Conference on Publication Date: 20-22 Oct 1997
On page(s): 46-56, Meeting Date: 10/20/1997 - 10/22/1997, Location: Philadelphia, PA, USA
ISBN: 0-7803-3968-1, References Cited: 21, INSPEC Accession Number: 5795024
Digital Object Identifier: 10.1109/HOLM.1997.637874 Current Version Published: 2002-08-06,
Available from IEEE

Abstract: A new type of twist-on splicing connector for use with aluminum and copper wire combinations is tested to determine initial resistance, performance in a zero-current environmental test, performance in a heat-cycle test, and portion of current carried by the connector's steel spring. The splices tested consist of two aluminum wires and one copper wire.

The aluminum wire samples used for the test are of the types actually installed in aluminum-wired homes. Initial resistance is found to be relatively high, and there is a significant sample-to-sample variation. This reflects failure to consistently establish low-resistance wire-to-wire contact through the insulating oxide film on the wire. Results of the environmental and heat-cycle tests show deterioration of a significant portion of the samples. The splices made with this connector are also found to be sensitive to mechanical disturbance, such as applied in normal installation when the completed splice is pushed back into the junction box.

Based on the test results, it is concluded that this connector has not overcome the fundamental deficiency of twist-on connectors for use with aluminum wire, and is not considered to be suitable for permanent splices in residential aluminum wire applications

This article describes the field results and testing of a twist on connector produced by Ideal Industries, Ideal#65 purple "Twister" twist-on connector listed and sold as a repair/retrofit for residential aluminum wiring.

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• Fire Hazards With Aluminum to Copper Twist-on Connectors & Acceptable Aluminum Wiring Repair Practices Color Photos, Current Issues. 9/28/95 CPSC Meeting Minutes
• "Is YOUR Aluminum Wiring Safe?" article discussing safety claims made by some people without looking at the wiring, J. Aronstein, 11/21/95
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