46 C.F.R. § 113.30-25 Detailed requirements.
Title 46 - Shipping
(a) Each sound-powered telephone station must include a permanently-wired handset with a push-to-talk button and a hanger for the handset, except those stations detailed in paragraph (d) of this section. The hanger must be constructed so that it holds the handset away from the bulkhead and so that the handset will not be dislodged by the motion of the vessel. (b) Each voice communication station device in the weather must be in a proper enclosure as required in §111.01–9 of this chapter. The audible signal device must be outside the station enclosure. (c) Each station in a navigating bridge or a machinery space must be in an enclosure meeting at least NEMA 250 Type 2 or IEC IP 22 requirements. (d) In a noisy location, such as an engine room, there must be a booth or other equipment to permit reliable voice communication during vessel operation. (e) In a location where the voice communication station audible signal device cannot be heard throughout the space, there must be an additional audible signal device or visual device, such as a light, which is energized from the final emergency bus. (f) If two or more voice communication stations are near each other, there must be a means that indicates the station called. (g) Each voice communication talking circuit must be electrically independent of each calling circuit. A short circuit, open circuit, or ground on either side of a calling circuit must not affect a talking circuit. Circuits must be insulated from ground. (h) Each connection box must meet at least NEMA 250 Type 4 or 4X or IEC IP 56 requirements. (i) Voice communication cables must run as close to the fore and aft centerline of the vessel as practicable. The cable must not run through high fire-risk spaces, such as machinery rooms and galleys, unless it is technically impractical to route them otherwise or they are required to serve circuits in the high-risk area. Cable running through or into these high-risk areas must meet the requirements of EC 331. [CGD 94–108, 61 FR 28289, June 4, 1996; 61 FR 33045, June 26, 1996; 61 FR 36787, July 12, 1996, as amended at 62 FR 23910, May 1, 1997]
Title 46: Shipping
PART 113—COMMUNICATION AND ALARM SYSTEMS AND EQUIPMENT
Subpart 113.30—Internal Communications
§ 113.30-25 Detailed requirements.
