This Article requires that guards that protect a level located more than 4.2 m (13 ft. 9 3/8 in.) above the adjacent level, except for those in industrial occupancies, be designed so that no member, attachment or opening located between 140 and 900 mm (5 1/2 and 36 in.) above the level protected by the guard facilitates climbing. Such guards must not be constructed with decorative features that young children could use as a foothold.
Some configurations of members, attachments or openings may be part of a guard design and still comply with NBC Sentence 9.8.8.6.(1). Figures 9.8.-21 to 9.8.-23 present a few examples of designs that are considered to not facilitate climbing.
Quoted from Illustrated User's Guide - NBC2015
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