Talk:Heated Bed
Note on electrical safety: any "live" metal - or any metal with uninsulated circuitry nearby - should be grounded: period. It is possible to kill somebody by inducing fibrillation if even a small current occurs across the heart (70mA is enough to cause this: though 700mA is more likely) - a current across the heart can occur simply by holding something with two hands...
While a current this high isn't likely due to the voltage and resistances used in heated beds - electrical mishaps can and do happen. All it takes is for a voltage regulator to fail and the controller board and a larger-than-intended current can be introduced to the system: and while PSUs should produce a steady voltage as required, it is again possible that electrical failure can cause live mains current to enter the system (while unlikely, this is more probable with hand-modified bench power supplies retrofitted from computer power supply units - and as laptop transformers are quite popular, I've noticed and indeed even owned a variety of wan hung low chinese knock-off brands that simply don't have the required protection if something fails)
As such I would suggest that a note be introduced to the page with regards to this and preferably rectifying the notes on "citation needed" - just look at any reliable peer reviewed paper on electrocution or electrical safety (pubmed.com if you have academic access or even google scholar though it's less reliable)
