PVC Securing Supporting Practice exam question. Table 352.30(B) doesn't line up with these answers unless I'm just missing something obvious here. 1) 1/2" - 1" is 3ft (not 5) and >1" 5ft (not 7) 2) 10 isn't anywhere *(but what i chose)* 3) trade 6 says up to 8ft 4) trade 2 1/2 & up allows >5ft