46 CFR §113.25-11

1. (a)Have normally open contacts and be constructed in accordance with Type 4 or 4X of NEMA 250 or IP 56 of IEC 60529:2013 (both incorporated by reference; see § 110.10-1 of this subpart) requirements;
2. (b)Have a switch handle that can be maintained in the “on” position;
3. (c)Have the “off” and “on” positions of the operating handle permanently marked; and
4. (d)Have an inductive load rating not less than the connected load or, on large vessels, have auxiliary devices to interrupt the load current.