An engineer is installing 22mm copper pipework to supply a domestic gas boiler. According to BS 6891, what is the correct method for protecting this pipework where it passes through a solid wall?
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A
Wrap the pipe in denso tape and seal the ends.
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B
Ensure the pipe is sleeved for its full length within the wall, and seal the annular space at one end.
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C
Paint the pipe with a corrosion-resistant paint before embedding it directly in the mortar.
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D
Encase the pipe in a larger plastic pipe and fill the void with expanding foam.