NH insulated CU and NH metalclad CU: definitions please?

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What are and where would one use the following: an NH insulated CU and an NH metalclad CU?
 
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Both Wylex ... depends on if you want metal or plastic. Insulated would be needed if you have TT with main RCD in the CU.
 
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This question makes me believe that you are on some kind of course, and you are using DIYnot as a provider of answers to your homework questions.

Are you on day release?

Why don't you ask, (i) your boss/colleagues or (ii) your tutor?
 

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