An extension-spring containment cable and a lifting cable have different jobs. If you cannot identify the arrangement, request inspection rather than assuming every visible cable serves the same purpose.
In this article
Understand the distinction
DASMA describes a containment cable running through an extension spring to help restrain it if it breaks. This differs from the cables involved in lifting the door. Presence of one type should not be used as proof that the other is correctly installed.
Avoid handling the spring system
If a cable is missing, loose or damaged, keep clear and describe the concern when calling. Do not unhook the spring or thread a replacement yourself. A door that still moves can nevertheless have a component that requires attention.
Ask for a system-specific explanation
Have the technician identify your spring arrangement and the components assessed. If the door uses a different spring design, the appropriate safeguards may be different. Keep the inspection findings and any repair scope in the service record instead of applying a diagram from another door.
Frequently Asked Questions
Do torsion and extension systems use identical safeguards?
No. Their arrangements differ; the installed system needs to be identified.
Does a safety cable make a broken spring usable?
No. A broken spring still requires professional repair assessment before normal operation.