that the entire building, and possibly an area surrounding it, should be considered a Class I, Division 2 or Zone 2 location.

2When classifying extent of area, consideration shall be given to fact that tank cars or tank vehicles may be spotted at varying points. Therefore, the extremities of the loading or unloading positions shall be used. [30:Table 8.2.2]

15 m (50 ft) —

■ 15 m (50 ft).

7.5 m

^ Division 1 VZA Division 2

Water level

Unclassified

Notes:

(1) The "source of vapor" shall be the operating envelope and stored position of the outboard flange connection of the loading arm (or hose).

(2) The berth area adjacent to tanker and barge cargo tanks is to be Division 2 to the following extent:

a. 7.6 m (25 ft) horizontally in all directions on the pier side from that portion of the hull containing cargo tanks

b. From the water level to 7.6 m (25 ft) above the cargo tanks at their highest position

(3) Additional locations may have to be classified as required by the presence of other sources of flammable liquids on the berth, by Coast Guard, or other regulations.

Figure 515.3 Marine Terminal Handling Flammable Liquids. [30: Figure 7.7.16]

515.4 Wiring and Equipment Located in Class I Locations. All electrical wiring and equipment within the Class I locations defined in 515.3 shall comply with the appli-

515.7 Wiring and Equipment Above Class I Locations.

(A) Fixed Wiring. All fixed wiring above Class I locations shall be in metal raceways, Schedule 80 PVC conduit, Type RTRC marked with the suffix -XW, or Type MI, TC, or MC cable.

(B) Fixed Equipment. Fixed equipment that may produce arcs, sparks, or particles of hot metal, such as lamps and landholders for fixed lighting, cutouts, switches, recep- tacles, motors, or other equipment having make-and- break or sliding contacts, shall be of the totally enclosed type or be constructed so as to prevent the escape of sparks or hot metal particles.

(C) Portable Luminaires or Other Utilization Equipment.

Portable luminaires or other utilization equipment and

their flexible cords shall comply with the provisions of

Article 501 or Article 505 for the class of location above

which they are connected or used.

515.8 Underground Wiring.

(A) Wiring Method. Underground wiring shall be installed in threaded rigid metal conduit or threaded steel intermediate metal conduit or, where buried under not less than 600 mm (2 ft) of cover, shall be permitted in rigid nonmetallic conduit or a listed cable. Where rigid nonme-tallic conduit is used, threaded rigid metal conduit or threaded steel intermediate metal conduit shall be used for the last 600 mm (2 ft) of the conduit run to emergence or to the point of connection to the aboveground raceway. Where cable is used, it shall be enclosed in threaded rigid metal conduit or threaded steel intermediate metal conduit from the point of lowest

cable provisions of Article 501 or Article 505 for the divi- sion or zone in which they are used.

Exception: As permitted in 5J5.8.

buried cable level to the