I'll second what Mike has said.


I spent 20 odd years working in the "Entertainment" Industry. Mostly power generation and distribution on the Music Festival circuit. Its very very different from a domestic sparks or even an industrial electrician. Even the numbers are different - supplying 2 feeds of 800A/phase onto a stage in the middle of a field was nothing out of the ordinary - all coming from diesel generation (hardly anybody trusts the mains, always be in control of your destiny). And then having to (try) and explain to someone why this "outdoor supply" cant be fed through a 30mA RCD!


Everything is built to be re-usable. It comes off a fleet of Artic trailers and its going back on them in about a week. We toured with 6 curtain sided trailers full of nothing but cable & distros. Cables tend to be one-size-up. So 16A (ceeform) on 2.5mm, 32A on 6mm, 63A on 16mm and 125A on 35mm, all that in both single phase & three phase in HR07 TRS., 25m of 35mm2 5 core TRS is heavy on the shoulder with the ceeform bashing your legs as you walk!! After that its CAMLOK or Powerlock on 120mm upto 400A - after that its parallel runs of 120mm. Pulling and laying 10 lengths of 120mm2 singles to parallel connect two 500kVA gensets on a hot summers afternoon in the middle of a field tends to make you break out into a sweat.


You have to take care of the boundaries between systems running from different supplies, especially were you don't want the earths to be common but also preventing and detecting earth loops were some fool has joined two outer points on your carefully designed radial distribution system with an ill thought-out audio link cable between a sound desk and OB truck!

I'll second what Mike has said.


I spent 20 odd years working in the "Entertainment" Industry. Mostly power generation and distribution on the Music Festival circuit. Its very very different from a domestic sparks or even an industrial electrician. Even the numbers are different - supplying 2 feeds of 800A/phase onto a stage in the middle of a field was nothing out of the ordinary - all coming from diesel generation (hardly anybody trusts the mains, always be in control of your destiny). And then having to (try) and explain to someone why this "outdoor supply" cant be fed through a 30mA RCD!


Everything is built to be re-usable. It comes off a fleet of Artic trailers and its going back on them in about a week. We toured with 6 curtain sided trailers full of nothing but cable & distros. Cables tend to be one-size-up. So 16A (ceeform) on 2.5mm, 32A on 6mm, 63A on 16mm and 125A on 35mm, all that in both single phase & three phase in HR07 TRS., 25m of 35mm2 5 core TRS is heavy on the shoulder with the ceeform bashing your legs as you walk!! After that its CAMLOK or Powerlock on 120mm upto 400A - after that its parallel runs of 120mm. Pulling and laying 10 lengths of 120mm2 singles to parallel connect two 500kVA gensets on a hot summers afternoon in the middle of a field tends to make you break out into a sweat.


You have to take care of the boundaries between systems running from different supplies, especially were you don't want the earths to be common but also preventing and detecting earth loops were some fool has joined two outer points on your carefully designed radial distribution system with an ill thought-out audio link cable between a sound desk and OB truck!