Inverter to AC disconnect Wiring

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KevinSm
KevinSm Registered Users, Users Awaiting Email Confirmation Posts: 1
Hello folks,

I had a situation at a customer's house.
My electrician pulled wires from an inverter to the exterior AC disconnect. and Neutral and Red were about 2 inches. 

Is it ok to use a polaris plug to extend the wires? or do you have to use an irreversible connector in order to extend the short wires?