While I would say you should "always" try to bend a 30 degree offset, sometimes you don't have the space. You need something a little tighter, shorter, in steps the 45.
The 45 degree offset has many of the same rules at a 45, 2 marks, rotate the conduit, with one bit difference, the multiplier. This isn't as easy as multiplying by 2, if you need to use a calculator or do long math on a wall, make sure it isn't the finished side.
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