Section 169.667 - Switchboards(a) Each switchboard must be in as dry a location as practicable, accessible, protected from inadvertent entry, and adequately ventilated. All uninsulated current carrying parts must be mounted on nonabsorbent, noncombustible, high dielectric insulating material.(b) Each switchboard must be- (1) Totally enclosed; and(2) Of the dead front type.(c) Each ungrounded conductor of a circuit must have at the point of attachment to the power source either-(1) A Circuit breaker; or(d) Each switch other than one mounted on a switchboard must be of the enclosed type.CGD 83-005, 51 FR 896, Jan. 9, 1986, as amended by USCG-2014-0688, 79 FR 58287 , Sept. 29, 2014