Section 27-994. Retroactive provisions

The provisions of this subchapter are
  not   retroactive  except  that  the  provisions  of  this  section  are
  retroactive. Existing elevators moved to  new  hoistways  shall  conform
  with  all the requirements for new installations. All alteration work on
  existing installations required by this section  must  be  completed  no
  later than December sixth, nineteen hundred seventy.
    (a)  Emergency  interlock  release switch. Emergency interlock release
  switches in elevator cars, where provided, shall be of the key-operated,
  continuous-pressure type and all other types now in use shall be removed
  or  replaced  with  approved  key-operated,   continuous-pressure   type
  switches.
    (b)  Machines -- belt and chain-driven. Single-belted and chain-driven
  machines shall be permitted only on  freight  elevators  and  only  when
  equipped  with  electrically  released,  spring  applied brakes and with
  terminal stopping devices and electrical safety devices as  required  in
  reference standard RS 18-1.
    (c)  Machines -- drum winding. Drum winding machines shall be equipped
  with electrical machine limits as set forth  in  reference  standard  RS
  18-1.
    (d) Car gate switches -- additions, replacement, or relocation of. Car
  gate  electric contacts where such devices are not provided or are found
  to be tied or blocked so as to render them inoperative shall  be  added,
  replaced  or  relocated as required by the commissioner. Installation or
  replacement  of  car  gate  electric  contacts  shall  conform  to   the
  requirements of reference standard RS 18-1.
    (e)  Elevator  hoistway-door  interlocks.  All  existing elevators not
  presently equipped with hoistway doors having door interlocks  shall  be
  provided  with  hoistway  landing  doors  equipped  with  approved  type
  hoistway-door interlocks conforming to  the  requirements  of  reference
  standard  RS  18-1. Approved-type interlock switches may be installed in
  connection with existing hoistway door closers, provided the combination
  door closers and interlocks conform to all the requirements for approved
  hoistway-door interlocks.  The  use  of  elevator  parking  devices  and
  hoistway  door  unlocking  devices  for  opening hoistway doors from the
  landing side shall conform to the requirements of reference standard  RS
  18-1. Exceptions:
    Interlocks  or  electric  contacts  shall  not  be  used  on hydraulic
  elevator landing doors or gates except where such elevators are provided
  with electric control and operating devices.
    (f) Emergency signal or telephone. Automatic  operation  elevators  or
  any elevator operated at any time without a designated operator shall be
  provided  with  an  audible  emergency  signal,  and except in buildings
  classified in occupancy groups J-1, and J-2, the cars shall be  provided
  with  a  telephone,  in  accordance  with  the requirements of reference
  standard RS 18-1.
    (1) Elevators with car switch  operation  shall  be  provided  with  a
  signal  system  by  means of which signals can be given from any landing
  whenever the elevator is desired at the landing.