Q. If the insulating material is hygroscopic, it must be
A. enclosed in fireproof covering
B. enclosed in waterproofing covering
C. air tight covering
D. any of the above
Answer: enclosed in waterproofing covering
A. enclosed in fireproof covering
B. enclosed in waterproofing covering
C. air tight covering
D. any of the above
Answer: enclosed in waterproofing covering