NEC 314 for junction box

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Hi Sir,
When i looked into NEC 314.16(Sizing of Pull, Junction, and device boxes), I looked at the table NEC 314.16(A), the size requirement is for Metal box. My question is how about the size of plastic junction box? is same requirement or no requirement for NEC?
another question is if the junction box is intergrated of one luminaire, NEC 314.16 is applicabel for that?
 
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