Section 111.05-20 - Grounded distribution systems on OSVs designed to carry flammable or combustible liquids with closed-cup flashpoints not exceeding 60°C (140°F)(a) This section applies to OSVs of at least 6,000 GT ITC (500 GRT if GT ITC is not assigned), as defined in § 125.160 of this chapter, that are designed to carry flammable or combustible liquids with a closed-cup flashpoint not exceeding 60 °C (140 °F).(b) A grounded distribution system is only allowed as provided in paragraph (c) of this section.(c) Grounding of the neutral for alternating current power networks of 3,000 volts (line to line) or more is permitted, provided that any possible resulting current does not flow directly through any hazardous locations.USCG-2012-0208, 79 FR 48929, Aug. 18, 2014