Cable size and protection - calculation

[Joenicholson1996]

If possible could anyone have a quick look over these steps I've made myself for cable sizing and the protection needed. Please let me know if I've missed out anything.

I also couldn't find a definitive answer for maximum permitted voltage drop percentage for 3 phase. I think it was 5% and 8% for lighting and power cable respectively.
Thanks in advance.

 

[Andy-1960]

Table 4Ab for your Voltage drop

 

[telectrix]

bear in mind that if using 90deg. thermosetting cable, the switchgear/OCPDs etc. and loads it connects may only be rated to 70deg.