A bend that is too tight damages things -- the raceway, the conductors, or both -- and it makes the pull harder before it does.
The damage happens inside the bend during the pull, which is the one place nobody can see and the one moment nobody wants to stop.
Think about what a conductor does going round a bend under tension. It is pressed against the outside of the curve, and the tighter the curve the harder it is pressed and the more it drags. Tighter bend, more friction, more tension needed, more force on the insulation at exactly the point where it is already being squeezed. The two problems compound rather than adding up.
Check yourself: The cable went through the bend. Was the bend acceptable?
Answer: Not established. A cable fitting through a bend does not prove the bend is acceptable.
Getting through is a physical outcome. The limit exists because of what the passage does to the conductor and the insulation on the way, and damage during a successful pull is still damage.
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Written from the owner's poster for this lesson. Nothing added beyond what the poster states.
Written for Texas apprentices as free study material. The Texas apprentice licence is an application, not an exam (Occupations Code 1305.161), and nothing here counts as apprenticeship hours or continuing-education credit. VoltMark is not affiliated with, endorsed by, or sponsored by NFPA, PSI, TDLR, or any state or local licensing authority. Always follow your employer's safety programme and your supervising electrician.
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