horizontally from any edge of the dispenser when the pit or trench is not mechanically ventilated.
1.5 m (5 ft) in all directions from dispenser
enclosure From 1.5 m to 3.0 m (5 ft to
10 ft) in all
directions from the dispenser enclosure
Up to 450 mm (18 in.) aboveground and within
6.0 m (20 ft) horizontally from any edge of
the dispenser enclosure, including pits or
trenches within this area when provided with adequate mechanical ventilation
[30A:Table 12.6.2]
■1 Class I, Div. 1 □ Class I, Div. 2
450 mm w,
(18 in.pn
Dispensing area
6.0 m (20 ft)-
450 mm (18 in.)
6.0 m (20 ft)
6.0 m (20 ft)
|
Dispensers |
||
|
6.0 m (20 ft) |
' > |
6.0 m (20 ft) |
Figure 514.3 Classified Areas Adjacent to Dispensers as Detailed in Table 514.3(B)(1). [30A:Figure 8.3.1]
514.4 Wiring and Equipment Installed in Class I Loca- tions. All electrical equipment and wiring installed in Class I locations as classified in 514.3 shall comply with the applicable provisions of Article 501.
Exception: As permitted in 514.8.
FPN: For special requirements for conductor insulation, see
501.20.
514.7 Wiring and Equipment Above Class I Locations.
Wiring and equipment above the Class I locations as classified in 514.3 shall comply with 511.7.
514.8 Underground Wiring. Underground wiring shall be installed in threaded rigid metal conduit or threaded steel intermediate metal conduit. Any portion of electrical wiring that is below the surface of a Class I, Division 1, or a Class I, Division 2, location [as classified in Table 514.3(B)(1) and Table 514.3(B)(2)] shall be sealed within 3.05 m (10 ft) of the point of emergence above grade. Except for listed explosionproof reducers at the conduit seal, there shall be no union, coupling, box, or fitting between the conduit seal and the point of emergence above grade. Refer to Table 300.5.
Exception No. J: Type MI cable shall be permitted where it is installed in accordance with Article 332. Exception No. 2: Rigid nonmetallic conduit shall be permitted where buried under not less than 600 mm (2 ft) of cover. Where rigid nonmetallic 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 underground run to emergence or to the point of connection to the aboveground raceway, and an equipment grounding conductor shall be included to provide electrical continuity of the raceway system and for grounding of non-current- carrying metal parts.
514.9 Sealing.
(A) At Dispenser. A listed seal shall be provided in each conduit run entering or leaving a dispenser or any cavities or enclosures in direct communication therewith. The sealing fitting shall be the first fitting after the conduit emerges from the earth or concrete.
(B) At Boundary. Additional seals shall be provided in accordance with 501.15. Sections 501.15(A)(4) and (B)(2) shall apply to horizontal as well as to vertical boundaries of the defined Class I locations.