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Posted By Alan Nicholls
Have I been asleap or missed something in the regs?
Machinery subject to maintenance should be isolated from its motive power source while it is being worked on if there is risk of contact with voltages likely to cause harm, ok so far I think.
1 Turn off isolation switch
2 Insert padlock/s into switch to prevent said machine from being turned on
3 Qualified engineer does what ever .
This constitutes a safe system of work as far as I recall.(I could be wrong though)
Engineering Manager allows engineer to enter machine control box remove main control pcb.
The control box still has 415 volts to the terminals inside the box as the only power control isolated was on the machine. The main isolator switch on the wall was still on.
When questioned the answer was thats ok.
Who is kidding who.
So have I missed something important?
Alan N
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Posted By Ken Taylor
Sounds like the engineer missed something - electrocution. The supply to the item being worked upon should normally be 'dead' and not just the equipment it is serving - unless 'live working' is essential and other adequate protective measures are taken in accordance with the published guidance.
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Posted By Peter Leese
Depends. If the mains terminals are suitably guarded/shielded, as with most reasonably modern equipment, then no risk.
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Posted By Dean Pugh
As this scenario is vague, one possibility of isolating the machine in question is to prevent induced current flow from the inadvertent movement of a motor that may be part of the machine.
Unless you are familiar with electric principles etc., it would be worth bringing in a person with expertise to carry out an overview of your SSoWs.
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