jonescg wrote: Same thing you do with a garden hose. Twist it out as you unravel it.
It is more complex than that.
Some cables (not just talking EVSE cables) exhibit curling and others simply do not.
I have some 3 core extention cables that curl and others that do not (and probably never will) so the number of cores or core size is not the cause. EVSE cables are 5 to 7 core with a mix of 2.5mmsq and .75mmsq (typically for 10-15A cable).
It appears that the twist direction of the cores vs their internal strands twist direction and the build and bond of the cores to the jacket are all part of determining the curling behaviour....as well as the shield material and construction if shielded.
A 'good' cable should not curl (in my thinking at least). Consider a quality microphone cable used in stage work.... unless it is chopped by furniture or something it will not curl or fail with quite incredible use/abuse.
I would expect that the curling is not dependent on handling, just that the cables are handled is enough and there is no handling method to avoid eventual curling. e.g. tight wrapping of the cable may produce early curling but, if it has the potential to curl, it will eventually.
The curling itself may be detrimental to cable life but attempting to remove the curls may well be destructive causing fatigue of the cores, particulary at the terminations. I'd say that a curled cable in regular flexing use will have a shortened life due to the stresses in the cores. The curl being a clear demonstation of the stresses.
Joseph, google around. There must be a master's thesis or something on the topic !