Non-Climbable Zones (NCZs) are unique places all around pools and spas created to avoid children from climbing more than fences and getting unsupervised access to the water. To forestall youthful small children from squeezing by way of pool fencing, the vertical gaps among palings or bars must not exceed 100mm. https://pool-inspections39482.blogtov.com/16351151/the-2-minute-rule-for-pool-barrier-inspections-brisbane