2006 New York Code - Standard Guard Rail And Toeboard.

 
    § 27-1050 Standard guard rail and toeboard. (a) Standard guard rail.
    (1) GENERAL REQUIREMENTS. A standard guard rail shall consist of a two
  inch  by four inch wood top rail (S4S) not less than three feet nor more
  than three feet six inches above the platform and a  one  inch  by  four
  inch  wood  intermediate  rail (S4S) midway between the top rail and the
  floor or toeboard, both supported by two inch by four  inch  wood  posts
  (S4S) spaced not more than eight feet apart.
    (2)  ALTERNATE  METAL RAILING. In lieu of wood construction, posts and
  rails may be constructed of at least one and one-quarter  inch  diameter
  standard  pipe  or  of at least two inch by two inch by one-quarter inch
  angles. Spacing of rails and posts shall be as required in paragraph one
  of this subdivision.
    (3) REMOVABLE SECTIONS OF RAILING. To provide necessary  openings  for
  intermittent  operations, one or more sections of a required railing may
  be hinged or supported in sockets.  When  supported  in  sockets,  rails
  shall be so constructed that they cannot be jolted out. A button or hook
  may  be  used  to hold the rail in fixed position. Substantial chains or
  ropes may be used to guard such openings in standard railings. Where  so
  used,  the chains or ropes shall be taut at the same height as the rails
  of the standard railing.
    (b) Standard toeboard. A standard toeboard shall be at least five  and
  one-half   inches   high  and  constructed  of  metal,  wood,  or  other
  substantial material. It shall be installed, where required,  along  the
  edge  of  any  floor,  opening, platform, ramp, or runway. Such toeboard
  shall be securely fastened to the posts and so installed  that  no  open
  space exists between the floor and the toeboard.