Code of Federal Regulations Title 46. Shipping § 46.111.105–39 Additional requirements for vessels carrying vehicles with fuel in their tanks

(a) If the ventilation requirements of ABS Steel Vessel Rules section 5–10–4/3 are not met, all installed electrical equipment must be suitable for a Class I, Division 1;  Zone 0;  or Zone 1 hazardous location.

(b) If the vessel is fitted with an approved fixed gas detection system set at 25 percent the LEL, each item of the installed electrical equipment must meet the requirements for a Class I, Division 1;  Class I, Division 2;  Zone 0;  Zone 1;  or Zone 2 hazardous location.