Section 5.9 Mine Elevators
In jurisdictions not enforcing the NBCC, Section 5.9 applies to elevators as covered by Part 2, permanently installed in mine shafts. The purpose is to provide vertical transportation of mine personnel, their tools and equipment, and mine supplies. By reason of their limited use, operating environment, and the types of construction of the mines served, compliance with Part 2 is modified as follows (see also Section 1.3):
(a) Substitute "Title 30 Code of Federal Regulations" or "state mine laws" (if applicable) for "building code."
(b) Substitute "mine" for "building."
(c) Requirements modified in Section 5.9.
NOTES (Section 5.9):
(1) Title 30 Code of Federal Regulations provides for certain additional and more stringent requirements. Where applicable, Title 30 requirements have been addressed in this Section.
The location and guarding of counterweights shall conform to Section 2.3.
The protection of space below the hoistways shall conform to Section 2.6.
(a) All pipes shall be secured to prevent interference with the elevator equipment.
(b) The clearance between pipes, fittings, brackets, and elevator equipment shall be not less than 25 mm (1 in.).
(c) All pipes shall be suitably identified as to their contents.
Machinery and sheave beams, supports, and foundations shall conform to Section 2.9.
The guarding of equipment and the standard railing shall conform to Section 2.10.
The protection of hoistway landing openings shall conform to Section 2.11, except as modified by the following:
(b) Requirement 2.11.14 does not apply.
(c) Requirement 2.11.15 does not apply.
(d) Requirement 2.11.16 does not apply.
(e) Requirement 2.11.17 does not apply.
(f) Requirement 2.11.18 does not apply.
(g) Requirement 2.11.19 does not apply.
(b) The car top access panel shall have an area not less than 0.58 m2 (900 in.2) and shall measure not less than 635 mm (25 in.) on any side. The panel shall open outward or slide over the car top. It shall be hinged, or be retained in a track. The movable portion of the access panel, if hinged, shall be provided with means to counterbalance the panel and restrain it from closing when in the open position. The force required to open the access panel or prevent it from closing shall not exceed 45 N (10 lbf). When in the fully opened position, the access panel shall resist accidental closing. The movable portion of the access panel shall not reduce the running clearance. The access panel shall be openable without the use of tools or keys.
(c) The car top access panel shall be provided with a switch whose contacts are positively opened mechanically, and their opening shall not be dependent on springs that will initiate a controlled slowdown and stop when the access panel is opened. A permanently mounted emergency stop switch shall be located on top of the car, adjacent to the access panel, to secure the car prior to transferring to inspection operation.
The rungs, cleats, or steps shall be spaced 300 mm (12 in.) on center. A clear distance of not less than 115 mm (4.5 in.) from the centerline of the rungs, cleats, or steps to the nearest permanent object in the back of the ladder shall be provided. Handgrips, if provided, shall have a clear distance of not less than 115 mm (4.5 in.) from their centerline to the nearest permanent object.
(a) not interfere with the use of the car top access panel
(b) be solid without perforations and shall comply with the strength requirements of 220.127.116.11
(c) provide a minimum head height clearance of 2 m (78 in.)
The counterweight safety switch shall be operated by the safety mechanism, or a means to detect application of the safety independent from the counterweight governor switch(es) shall be provided.
(a) Oil buffers shall be suitable for operation at the extreme temperatures experienced in the anticipated mining environment.
(b) Requirement 18.104.22.168.1(c) applies, except that all oil buffers shall be provided with a switch conforming to 22.214.171.124 that will cause the power to be removed from the driving machine when the plunger is not within 13 mm (0.5 in.) of the fully extended position.
Car and counterweight guide rails, guide-rail supports, and fastenings shall conform to Section 2.23.
Emergency stop switches shall
(a) be the manually opened and closed type
(b) have red operating buttons of the push-to-stop configuration and be designed, installed, or guarded to protect against inadvertent movement of the switch
(c) be conspicuously and permanently marked "STOP," and shall indicate the "STOP" and "RUN" positions
(d) while open, cause the audible device to sound (see 126.96.36.199)
(e) conform to 188.8.131.52
Elevators shall be provided with an emergency or standby power system to operate the elevator if the normal power supply fails. The emergency or standby power system shall be capable of operating the elevator with rated load. The emergency or standby power system shall be capable of providing rated load power for a period of at least 4 h.
The transfer between the normal power system and the emergency or standby power system shall be automatic.