Matt and Martin,
3 x 8 feet is what I use.
In the Manual of Style for NFPA Technical Committee Documents, Section 3.2.1.2 states, “Spelling and definitions of general words and terms shall follow Webster's Collegiate Dictionary, 10th edition.” Section 3.2.2.3 states, “When a standard definition is needed, Webster's shall be utilized where the meaning is correct and accurate as used in NFPA documents.”
Section 410.4(D), Bathtub and Shower Areas, addresses luminaires (fixtures) in specific locations. It states that “No parts of cord-connected luminaires (fixtures), hanging luminaires (fixtures), lighting track, pendants, or ceiling-suspended (paddle) fans shall be located within a zone measured
900 mm (3 ft) horizontally and
2.5 m (8 ft) vertically from the top of the bathtub rim or shower stall threshold. This zone is all encompassing and includes the zone directly over the tub or shower stall.”
Section 406.8(C), Bathtub and Shower Space, addresses receptacles in damp or wet locations. It states, “A receptacle shall not be installed within a bathtub or shower space.” See dimensions above
Webster's Dictionary defines space as “a limited extent in one, two, or three dimensions.” Working space is perhaps a good example of the use of the word space. Working space is given as a depth, width, and height — three dimensions. Webster's defines zone as, “a region or area set off as distinct from surrounding or adjoining parts.” Hazardous (classified) locations are a good example of the use of the word zone. Zone is used extensively for classifying hazardous locations in distinct areas.
Knowing this, a reasonable conclusion is that the words space and zone do not have the same meaning. Space is less defined and zone is more defined. However, if we refer to 225.19(E), Zone for Fire Ladders, it would appear that space and zone are one in the same. Section 225.19(E) states in part that, “. . . overhead lines shall be arranged, where practicable, so that a clear space (or zone) at least 1.8 m (6 ft) wide will be left either adjacent to the buildings . . .” In this case, a reasonable conclusion is that space and zone have the same meaning.
Where does this lead us? Where the word space is used in the Code, it allows for some flexibility and judgment in code enforcement (i.e., receptacles along the floor line of a wall space); it is less stringent. Where the word zone is used in the Code, it does not allow for the same flexibility and judgment in code enforcement (i.e., hazardous (classified) locations); it is more stringent.
I hope this provides some guidance for a reasonable conclusion. If you would like to debate this issue further, I would suggest throwing the word area into the mix too! — Lanny McMahill, CMP-18
Focus on the Code: CMP-18
