Neutral split

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Good day all,

I am currently busy with alterations at a small factory that is in the proses of being sold and would also require a CoC. While working a came across this neutral(50mm) in the SUB DB which has its stands split and connected independently to the neutral bar due to the fact that the neutral bar cannot accommodate the size.
I would like to know if this is acceptable and where it states in SANS?
I have located the previous electrician that did this job and he says its acceptable because the size of the neutral is not reduced.

Any input?

Thanx