Connectors marked ____ are suitable for use with aluminum, copper, or copper-clad conductors?    1. CO-ALR only   2. AL/CU only   3. UL 9   4. CO-ALR and AL/CU   What is the correct answer? Why?

EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN:9781337516549
Author:Simmons
Publisher:Simmons
Chapter4: Conductor Sizes And Types, Wiring Methods, Wire Connections, Voltage Drop, And Neutral Conductor Sizing For Services
Section: Chapter Questions
Problem 27R: It is permissible for an electrician to connect aluminum, copper, or copper-clad aluminium...
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Connectors marked ____ are suitable for use with aluminum, copper, or copper-clad conductors? 
 
1. CO-ALR only
 
2. AL/CU only
 
3. UL 9
 
4. CO-ALR and AL/CU
 
What is the correct answer? Why?
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