I know that to add this is very late but just in case someone is trying to find out what to do then........LOOKING AT ELECTRICAL REGULATIONS IS THE WRONG PLACE; LOOK AT HEALTH AND SAFETY.
Quote "Where maintenance requires that normal guarding is removed, or access is required inside existing guarding, then additional measures are needed to prevent danger from the mechanical, electrical and other hazards"....... "The basic rules, however, are that there should be isolation from the power source (usually, but not exclusively, electrical energy), the isolator should be locked in position (for example by a padlock), and a sign should be used to indicate that maintenance work is in progress. Isolation requires use of devices that are specifically designed for this purpose; not devices such as key-lockable emergency stops or other types of switches that may be fitted to the machine".
One point that has not been mentioned is size /rating of the isolators. If the rating is less than the contacts can safely break when some one switches the motor on or off whilst on full load or full starting current you will need to have an isolator that breaks the control circuit before breaking the power circuit (early brake late make contacts) and the opposite for when you switch the isolator back on. This also means you have to run wiring for the control circuit to the isolator as well as the power cable. And no just running the control circuit through the isolator is not sufficient.
