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In the UK the use of electricity at work is regulated, the HSE guidance on Electricity at Work may be downloaded at this link: 
Note: about 8% of fatalities at work are caused by electric shock, (12-16 employee deaths) 210-258 Major Accidents and 500 over three day accidents each year.
Using FE Birds 1969 triangle that is: 5000 minor injuries, 15,000 Damage Accidents & 300,000 near miss accidents every year in the UK due to electricity at work!
I need to make up some single-phase extensions. What cable should I use?
I need to make up some three-phase extensions. What cable should I use?
What is Three Phase Power
See Three Phase
What are RCDs