1956 NEC;
4156. LAMPHOLDERS,SCREW-SHELL TYPE. Lampholders of the screw-shell type shall be installed for use as lampholders only.
4113. FIXTURES NEAR COMBUSTIBLE MATERIAL. Lampholders installed over specially combustible material shall be of the unswitched type and unless individual switches are provided, shall be located at least 8 feet above the floor, or shall be otherwise so located or guarded that the lamps cannot be readily be removed or damaged.
