U.S. Code of Federal Regulations
Regulations most recently checked for updates: Oct 26, 2020
Each contact maker must -
(a) Have normally open contacts and be constructed in accordance with Type 4 or 4X of NEMA 250 or IP 56 of IEC 60529 (both incorporated by reference; see 46 CFR 110.10-1) requirements;
(b) Have a switch handle that can be maintained in the “on” position;
(c) Have the “off” and “on” positions of the operating handle permanently marked; and
(d) Have an inductive load rating not less than the connected load or, on large vessels, have auxiliary devices to interrupt the load current.