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I have a scenario where there is a three phase DB in a commercial property where there are mixture of three phase and single phase washing machines.

All the washing machines including those that are single phase have triple pole MCBs installed and wired in 5-core to 16A rotary isolator. from the same isolator a 5-core rubber flex is used and then of those five cores two of the phase L2 and L3 have been WAGO'd in the next single phase washing machine, exactly the same but L1 and L3 have been WAGO'd

Googling this type of things has yielded a mix bag of opinion from stating remove the TP breaker and install a single pole breaker, some have said this is fine as some machine would utilise only a single phase on low-load in any case. Other have said it is okay as the TP breaker would still trip on overload of the single phase being used or on short circuit and have gone as far as saying it's possibly been done where a pre-existing machine used the three phases and now only utilise one.

Would you recommend making safe the other two phases at each end of the cable and installing a single pole MCB? or Would you say that there aren't any issues for this setup?

Any insights or opinions on this one would be grateful.
 

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