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It's also pretty common for trades to assume they are covered by an rcd without even checking.
I bet if they worked for a big company with a H&S department and pages of risk assessments they would bring their own RCD to site.
jellybaby-
In that situation the firm they're working for will turn off 240v and will have their own specialist 110v supply with FUCKING HUGE waterproof 3 pin plugs. Leaving you with 2 choices; batteries or 110v a big reason why people who work on both CSCS and domestic sites will go for batteries - they don't have to buy 2 sets of tools. Also if you have batteries only, then you only need to get your chargers PAT tested every 6 months not every fucking tool you own or if you're that way inclined it saves you a packet on moody PAT test labels from Amazon
The thinking being that the 110v supply is less dangerous however labourers will still do what labourers do and find a way to hurt themselves.
Bobbo
It's also pretty common for trades to assume they are covered by an rcd without even checking. Especially dangerous if you're outside on scaffolding or cutting stuff in the back garden. It's one reason I've heard given for the popularity of battery powered tools, less hassle on site and no 110/240v decisions.