Connect Calculation Issue

Hi,

Sizing cables as per BS7676.

It (tabulated cable rating)

In (protective device rating)

It > In/de-rating factors.

Therefore 70mm2 SW/PVC 4 C = 207A table 4D4A

In = 200A cg = 0.87

200A/0.87 = 229A

207>229 It is not greater than In therefore cable is not big enough for a 200A fuse, however the calculation has not flagged this as an error.

Please advise.

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