What is the purpose of a pre-molded joint in underground cables?
To securely connect two or more cables
A cable joint exists to restore both the conductor path and the insulation where two cable lengths must be brought together in a run, and a pre-molded joint achieves this with factory-made insulating components.
The pre-molded insulating body is manufactured to precise dimensions and slipped over the prepared meeting point of the cable ends, so the stress control and insulation are consistent and reliable.
Its purpose is to make a sound mechanical and electrical connection between two or more cable conductors while rebuilding continuous insulation across the join, so the underground cable behaves as one.
Terminating a cable at equipment is done by a cable termination or gland, not a joint, so that option names a different fitting.
Regulating cable voltage is a function of transformers and regulators, something a passive joint cannot do.
Merely insulating a single cut end is only part of the story; the defining role of a joint is to connect cables together, which the insulation then covers.
Hence, the answer is To securely connect two or more cables.
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