Section 19-119. Vault openings; protection of

It shall be unlawful for any
  person to remove or insecurely fix, or cause, procure, suffer or  permit
  to  be  removed or to be insecurely fixed, so that the same can be moved
  in its bed, any grate or covering or aperture  of  any  vault  or  chute
  under  any  street.  However, the owner or occupant of the building with
  which such vault is connected, may remove such grate or covering for the
  proper purpose of such vault or chute. The opening or aperture shall  be
  inclosed,  while such grate or covering be removed, with a strong box or
  curb at least twelve inches high, firmly and securely made. Openings  of
  more  than two square feet of superficial area shall be inclosed at such
  times with strong railings not less than three feet high, to be approved
  by the commissioner. Such grates or coverings shall not in any  case  be
  removed  until  after  sunrise  of  any day and shall be replaced before
  one-half hour after sunset.