Copper conductor is the only electrical wire conductor approved for use with the Cisco 10000 series ESR.
(Copper conductor; is; the only electrical wire conductor approved for use with the Cisco 10000 series ESR) (the only electrical wire conductor; approved; for use with the Cisco 10000 series)
Copper conductor the only electrical wire conductor
is approved
the only electrical wire conductor approved for use with the Cisco 10000 series ESR
for use with the Cisco 10000 series