CO/ALR Devices

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Have some interesting comments made by various persons regarding the use of CO/ALR devices.
A customer was told that all the CO/ALR devices in her house need to be replaced with devices rated for copper conductors.
HER HOUSE IS WIRED WITH COPPER CONDUCTORS.
The devices used in the home are CO/ALR rated.
As far as I know, CO/ALR devices can be used with copper or aluminum conductors, but if aluminum conductors are being utilized, I must have CO/ALR rated devices.
Can anyone direct me to any documentation that I might find on the web to validate the proper conductor use with CO/ALR devices?
Since this customer is hearing different statements from various persons, I would like to show her in writing what the UL and industry recommended and acceptable use actually is.

Thank you in advance for any input and direction.
 

bphgravity

Senior Member
Location
Florida
Re: CO/ALR Devices

From the RTRT.GuideInfo from UL:

Terminals of 15 and 20 A receptacles not marked "CO/ALR" are for use with copper and copper-clad aluminum conductors only. Terminals marked "CO/ALR" are for use with aluminum, copper and copper-clad aluminum conductors.

Terminals of receptacles rated 30 A and above not marked "AL-CU" are for use with copper conductors only. Terminals of receptacles rated 30 A and above marked "AL-CU" are for use with aluminum, copper and copper-clad aluminum conductors.
 
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