Relocating an existing 400A single phase panel about 3 feet away

[LarryFine]

A little slack is reasonable, but you can't leave feet of slack for every circuit.

 

[Jpflex]

A little slack is reasonable, but you can't leave feet of slack for every circuit.

Unless your employer is known for making last minute changes on a regular occurrence or you suspect the mounting area may be altered due to free space or another reason, I would say go for it and use the excess wires for jumpers

 

[augie47]

He's moving the panel 3 ft. Where in most circuits are you going to be able to have 3 ft of slack ????

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[LarryFine]

He's moving the panel 3 ft. Where in most circuits are you going to be able to have 3 ft of slack ????

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And how could the original installer have known whether three feet would be enough?