Some of the considerations for flex outside are:-
When the weather goes really cold it loses its flexibility,
(not a worry if fixed to a wall.)
UV rays from sunlight can reduce life of sheath, causing faster deterioration,
(not a worry if kept shaded out of direct sunlight.)
Physical knocks bumps and wear and tear,
(not to great a problem if carefully selected position or additional mechanical protection.)
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erm
I think me brain is empty again now.....
Dekes Dog Ate The String You Know? :C