I tend to believe the OP is being straight up in this instance, if they don't know what they need, I don't think it's a DIY job.
It rings a bit different to 'what size cable do I need for my electrician to connect my shed up? The trench is being back filled tomorrow'
It rings a bit different to 'what size cable do I need for my electrician to connect my shed up? The trench is being back filled tomorrow'