R920-50-10. Revised and Additional Provisions

  The revised and additional provisions of this section shall only apply when referenced in R920-50-11 "Applicable Provisions."

  (1) "New installations and relocated installations." ANSI B77.1 Section 1.2.4.3 is modified by the following requirement: New ropeways and relocated ropeways shall comply with the new or revised requirements of the Governing Standard and with these rules at the time of the acceptance test.

  (2) "Auxiliary power unit." Installations prior to November 1, 1994 shall meet the requirements for auxiliary power units, as set forth in ANSI B77.1-1992, 2.1.2.1.1, 3.1.2.1.1, 4.1.2.1.1.

  (3) "Electronic speed-regulated drives." Installations prior to November 1, 1994 shall meet the requirements for electronic speed-regulated drives as set forth in ANSI B77.1-1992, 2.2.1.8.2, 3.2.1.8.2, 4.2.1.8.2, 5.2.1.8.2, 6.2.1.8.2.

  (4) "Rope position monitoring." Installations prior to November 1, 1994 shall meet the requirements for rope position monitoring, as set forth in ANSI B77.1-1992, 3.1.3.3.2, paragraph 6.

  (5) "Friction type brakes." Installations prior to November 1, 1995 shall meet the requirements for friction type brakes, as set forth in ANSI B77.1-1992, 2.1.2.5, 3.1.2.5, 4.1.2.5, 5.1.2.5, 6.1.2.5.

  (6) "Wire rope inspection." Inspections shall be performed according to ANSI B77.1 Annex A.4.1 and ANSI B77.2 Annex A.4.1 and shall be performed by a competent inspector defined by the Governing Standard and who is approved by the Committee. The wire rope inspector shall certify to the owner or area operator whether the wire rope in its present condition meets requirements for continued operation.

  (7) "Audible warning devices." Requirements for audible warning devices on installations prior to April 17, 2007.

  (a) Installations shall meet the requirements for audible warning devices as specified by ANSI B77.1-1999, 2.1.1.12, 3.1.1.12.

  (b) Installations prior to April 17, 2007 ANSI B77.1-1999 Section 4.1.1.12 is modified by the following requirement: The aerial lift shall incorporate an audible warning device that signals an impending start of the aerial lift. After the start button is pressed, the device shall sound an audible alarm for a minimum of two seconds before the aerial lift begins to move. The audible device shall be heard inside and outside all terminals and machine rooms above the ambient noise level.

  (8) "Conveyor Standards." Requirements for installations prior to May 11,2018.

  (a) Loading and unloading area requirements of ANSI B77.1 section 7.1.1.9 shall also accommodate the use of adaptive devices.

  (b) Power units referred to in ANSI B77.1 section 7.1.2.1 may not have reverse capability.

  (c) "Power supply cords" referred to in ANSI B77.1 section 7.2.1.5.6 shall be protected from snow grooming, skiers, and other equipment and shall be ground fault protected.

  (d) For installations prior to May 11, 2018 the belt transition entry stop device referred to in ANSI B77.1 section 7.2.3.3 shall include redundant (double) sensors or an equivalent system submitted by a qualified engineer to prevent operation in the faulted condition. Each sensor shall be part of an independent control circuit that can initiate an emergency shutdown of the conveyor. The device shall be so designed and maintained that no single point of failure can cause the entry stop device to malfunction. The device shall not be remotely resettable and shall require the operator to reset the device prior to restarting the conveyor.

  (9) "Air Space Requirements." ANSI B77.1, section 2.1.1.4, 3.1.1.4, 4.1.1.4, 5.1.1.4, and 6.1.1.4 and ANSI B77.2 section 2.1.1.4 shall also include the following: No structure (temporary or permanent) shall be permitted to encroach into the air space of the ropeway. Ropeways and Structures that were both constructed prior to November 1, 2006 do not need to comply with this requirement.

  (10) "Portable Ropeways." Portable ropeways shall not be considered new ropeways when moved to different locations but remaining under the jurisdiction of the same operator.

  (11) "Tows Requirements."

  Handle Tows shall have stop gates above and below the rope.