Jeff
You make wide sweeping statements without considering the facts.
Do you not consider the following small example of a much larger list to be professional ?
Large motor repair garages,fleet transport depots, commercial vehicle test centres, car dealers,mobile car valeters, professional hand car wash,skip hire companies, plant hire companies, reclaimation companies etc at all these establishments you will see both large electrical powered steam cleaners, cold pressure washers and vacumm cleaners being used in the open air.
As you havent actually seen our guttervac you will not have the benifit of noting that the units switches are protected by sealed waterproof housings.
There is no law to state that 240v can't be used outside, not even H&S have the power to force anyone to use 110v equipment.
Firstly I would like to point out that 110v center tapped or below voltage power tools are not a legal requirement even on construction sites; The use of 110v center tapped and below equipment is an ACoP and best practice. The HSE will frown upon higher voltage powered tools being used, but cannot dictate the use of 110v due to EU directives.(if the UK HSE enforce the use of 110v they are in direct breach of those directives and the philosophy of an open market within Europe).
The HSE expects support from industry on the best practice of using 110v and below powered tools as they have been proven not to kill anyone who use them, this requirement (the use of 110v center tapped or below powered tools) should be identified within your company H&S policy and the Construction Phase HSE Plan,
240v and greater electrical v power and tools can be used on site, however strict control measures are required; the use of armoured cabling, shortest lead lengths as possible, RCB's/RCD's within the line, earthing, weather proofing, stringent inspections and useage, etc.. must be in place prior to use (ACoPs are available from the HSE).
110v center tapped power tools are more sturdier and have been designed and manufactured for construction, furthermore the use of these power tools will reduce loss or theft of their 240v counterparts, due to the fact you cannot use 110v at home.
Furthermore an electrical appliance register must be formed and developed to enter the electrical equipment/tools details and records of inspections on the site, all appliances must be tagged and Portable Appliance Tested (PAT) every 3 months unless specified as low risk; such as fax machines, kettles, photo copiers, etc.
Some electrical powered tools that are greater than 110v being generally used on construction sites; electrical hoists, Sky climbers, overhead gantry's, electrical welding equipment, specialist core drilling,radiography, etc.....
Going onto a site with 240v and then being thrown off by the site agent is not because its H&S Policy but in direct support of the directive and them being responsible companies.
As with most UK legislation they are Risk Assessment based.
Apart from your switches being sealed waterproof housings I am also aware that omnivac 240v systems are double insulated for safety and that omnivac take safety very seriously, I don't own an omnivac but I do my homework, maybe one day I will get the chance to see one?
What I am trying to ask suppliers is? If they could just let any buyer of 240v equipment aware of what they need to safely run your system outside, your vac is safe but is the extensions and trips (Rcd's) the end user adds (if at all) are safe.
Just imagine this sinario
A window cleaner or one of his customers are electrocuted while using your equipment, news papers aren't going to say that the vac was safe it was his extension lead that was faulty, they want the full glory and a picture of your vac would make good capturing headlines, and of course H&S will want to investigate.
If you were to make all your customers aware of the dangers of using under rated cables, plugs and sockets to extend your equipment, then you as a responsible supplier in my mind would deserve a big pat on the back.
You don't need to be aware of electrical regs to give this info but good advice for there safety is excellent advice and of course it doesn't add any extra costs to your product, but you could add the correct product as extra's for them to purchase.
Like I've said to you before, I have never and never will run your systems down because they are good products, well made, and well manufactured.