Another 17th edition exam question?

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shakin2011

59. A flat twin and cpc clipped direct to a ceiling joist where thermal insulation exceeds 100mm thickness is installation method:

[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]A. 101
B. 100
C. 3
D. 20

can you help me find the answer and where please, thx!

P.S i think the question may not make sense
[/FONT][/FONT]
 
101, appendix 4 table 4A2 page 265 BRB.
 

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