Answer / ra

cables for 13.8 kv is consider to be medium voltage (not HV ) and if it is routed in cable duct so there is no issue.the purpose of cable duct is to provided safety to cable route.
in case if the cable buried in ground, executor of building construction should notify the client through technical query to solve the issue by technical way according to specification and standard.
in my opinion builder suppose to keep opening for cable routing

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