I understand in the UK, they use 240 to 120 ct transformers to provide jobsite power for power tools for safety reasons. Do these tools have NEMA 5-15 plugs? If not, what type? What about small jobs, do you have a transformer with you, or do you also have 240v tools, drills,saws,etc. Thanks Robert
Hi Robert, we do use 110V CTE on UK building sites for portable lighting & power tools. Supply is from a 240/110 Centre tapped earth transformer. These transformers are typically portable units of 2 to 3 KVA with a standard 13A BS1363 plug on the supply cord & BSEN 60309 16A 110V (yellow) sockets on the transformer. Larger building sites have non-portable transformers hard wired in various locations throughout the site, usually on each level. The larger units have both 16A & 32A sockets to cater for heavier loads. The plugs used are BSEN 60309-2 (formerly known as BS4343) type, colour coded yellow. The US 5-15 plug is never used, it would not be considered robust enough for site use. I'm sure Paul may be able to provide a link to a site where you could view these transformers. Hope this helps. David
As well as these portable single-phase xfmrs, large sites can also have 3-ph distribution, a Y secondary with grounded star-point, 110V between phases, 63V phase-to-ground. There no distributed neutral; 110V power tools are connected between two phases.