Section 27-937. Omission of standpipe service

(a) Standpipe outlets may be
  omitted in portions of first floors or  basements  that  are  completely
  separated  from  the  entrance hall or enclosed stairways leading to the
  upper  floors,  provided  portable  fire  extinguishers  are  installed,
  subject to the approval of the commissioner.
    (b)  Standpipe  protection  shall  be omitted from transformer vaults,
  high-tension switchboard rooms, and other locations  where  the  use  of
  hose streams would be hazardous. Any space or room that houses equipment
  of  such  nature  that the use of water would be ineffective in fighting
  the fire, or would be hazardous, shall have a conspicuous metal sign  on
  each  door  opening  on such space or room stating the nature of the use
  and the warning: "Use No Water".