r/electricians • u/bhokolatebhipbookies • 7d ago

Code question

I’m currently doing my advanced level schooling and I got a code hw question that says “…a 480-240 XFMR has 90°c rated termination, the primary side is fed with RW90XLPE (unjacketed) and the secondary is fed with tw75…”.
If terminations are rated for 90° how can you use a 75 degree insulated conductor?

EDIT: this is based off the CEC

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u/[deleted] 7d ago

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u/bhokolatebhipbookies 7d ago

Thank you, so I would size tw75 using the 75° column and the rw90 using the 90° column in table 2?

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u/QuarkchildRedux [V] Apprentice 7d ago

pretty sure you have to go with the lowest rating of the entire circuit but im just an apprentice. just been doing ampacity stuff lately with termination ratings and such.

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u/Rickybobbie90 [V] Journeyman 7d ago

You would only need to make adjustments for the wire that has the lower rating.