According to 46 CFR, Subchapter J (Electrical Engineering), what statement is true concerning the use of twist-on connectors?

Correct Answer: Option C — Twist-on connectors may be used in enclosures as long as the insulating cap can be secured to prevent loosening due to vibration.

Per 46 CFR Subchapter J and IEEE 45 guidelines, twist-on connectors are generally prohibited for shipboard use due to vessel vibration, but may be used inside suitable enclosures if the insulating cap is mechanically secured to prevent loosening and potential short circuits.