Underground Power and Control Cable installation shall be as per SAES-P-104 paragraph 10.
Minimise the number of Splicing of Conductors for main cable from SEC SS-2 to Switchgear (Swgr 1&2), Splicing of conductor shall be as per SAES-P-104 paragraph 5.6.
Control Cable shall not be install directly above the Power Cable (13.8kV MV Cable) as per SAES-P-104 paragraph 10.14. 
Consider to use latest revision of Electrical One Line Diagram for 13.8kV switchgear (Swgr 1 & 2).
