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Spirent KB Article
Doc ID: FAQ16281
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Spirent TestCenter: What is the power cable type for a N4U chassis?
The sockets on the back of the N4U are C20.
NEMA L6-20R cable will not work.
You can get various connections on the other end.
The cables that ship with the unit have the standard NEMA 5-15P plugs, rated to 16A.
Product : Spirent TestCenter,Chassis