Why fuse the neutral in TN?C?S?

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We live in the Philippines in an area served by an electric cooperative. Our utility service is two wire (L and N) 230 VAC (TN?C?S). It is the local custom to use DP main and branch breakers protecting both the load and neutral. Each residence has its own ground rod. N and G are bonded in the panel box. Is there an engineering rationale for using DP breakers (GE TQL 2420X is a favorite) rather than SP breakers and a common neutral bus? Protection from utility company open neutrals?
 
Perhaps it is to allow easier installation of GFCI breakers? Just a supposition though.


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