Ian Tech, where are you located? East Bay and your source bring up the possibility of other than the US to ask.
EDIT by Mod.: In Ian's case, "East Bay"=East San Francisco Bay, aka Oakland/Berkeley California, USA. @IanTech , stay away from sites ending in .uk or .eu .
If US, CamLoc is still the standard for 400A in the industry here. PowerLoc 400A is the standard for
feeder in Europe. After that you get into
CeeForm for sub-connectors... a brand but kind of a standard like
Hubbell is mostly a standard "
Hubbell Twist" here.
What
voltage are you planning for your outputs, and how many Euro tours are you planning to
house verses domestic ones?
For the most part, if 120/208v
Wye wiring, you want CamLoc and probably L6-20 outlets for 208v
power. More of a standard than L6-15 especially if breakered for 20 Amp. If providing 416/230v
Wye wiring as per Europe, you want PowerLoc and
CeeForm.
Providing PowerLoc and
CeeForm for outputs for the most part would be a mistake unless also providing a large +75KVA
transformer say in pre-providing such outlets with 416/230v
power. What mostly from Europe wants to
plug into those plugs wants 230V not 208V. If
voltage ranging lights/gear that has a range from 120v-240v.... it is much more simple to provide standard US outlets if in the US, and make adaptors to
CeeForm. That way you are standard in providing
power for 120/208 volts in outlets.
Correction to Derek's post. Big Twist, Little Twist fine for term but within bounds of
voltage.
NEMA Code designates the "L" means Locking. "5" as 120v and "6" as 208v. Following that is the amperage
rating "15" or "20" Amps. So a L5-15 is a 15Amp
Twistlock 120v "Little Twist"
plug A L5-20 is a 20Amp
Twistlock 120v "Big Twist.) By his defination. Same concept for the L6-15 and L6-20 but for 208VAC.
Big question is for the L21-30 verses the L21-20
outlet if to specify for smaller loads or often hoists. Where I work is L6-15 above in spec. hold over from the 70's and I would specify L6-20 in general as correct for others. Easy enough to make another
adaptor.
L21-30 for three
phase 120/208v
Wye power we use and much of the industry does, but you still find those using L21-20 outputs. The L21-20 is not the optimum
outlet to use other than if specific for amperage usage of something. More adaptors for touring needs.
And or, as opposed to making a bunch of adaptors... specify what you have and the tour will probably pre-plan in bringing what they need to adapt with. Bins full of adaptors where I work, even some converting 120v to 208v and the reverse (non labeled as ours). If they have Euro gear, possibly adaptors will be needed, or you might need a
transformer.
Working on outfitting a
leg of a large Euro tour for the fall now. Following Euro standards, they would want our AC
Distro racks PowerLoc. But there is more to it than just changing the inlets, different higher standard breakers are also common for use. So it might in debate be cheaper to just buy Euro
Distro racks for the tour compliance. Getting more complex to world tour stuff these days. Almost need two different systems, and indeed now
stock many 120/208v Step up and step down to 416/230v transformers of various sizes for stuff not auto ranging in transformers. Doubt in a
house you should worry about providing such gear - tour's responsibility or perhaps with your help.