On 26/03/2015 21:37, ARW wrote:
"Nightjar .me.uk" "cpb"@ insert my surname here wrote in message
...
On 26/03/2015 08:50, Jethro_uk wrote:
On Thu, 26 Mar 2015 07:56:48 +0000, Nightjar "cpb"@ wrote:

We used to remove fuses and pocket them.

Difficult if you have circuit breakers

Aren't all circuit breakers removable ? Our (domestic) ones are. Surely
they're meant to be replaceable ?


On the distribution boards in my factories, that would have involved
turning off the three-phase supply to the entire factory, which would
allow the front cover to be removed. That would give access to the
screws holding the circuit breakers in place and then they could be
removed. It is not something you would do to permit safe working on a
particular machine.

In any case, all industrial equipment should have a local method of
isolation and those can always be padlocked in the off position. You
shouldn't really need more than that, possible with the multiple
padlock devices Tim Watts describes if more than one person might be
working on the protected equipment at one time.

Why would all the factory have to be powered down? Did your DBs not have
their own main switch?

Most of the factories only needed one distribution board; much of the
work was hand work or used single phase equipment. One of them needed
two boards, so there only about half the factory would have needed to be
shut down.


--
Colin Bignell