* Do not touch a charged part other than the secondary conductor.
* Always wear dry and well insulated gloves during operations.
* Do not use cables that have capacities below the specified requirement, that
are damaged, or that are exposing their conductive parts.
* Do not use the welder with its case or cover removed.
* Make sure that installation, maintenance and inspection are conducted at least
5 minutes after all of the input side power sourde are turned off by the switched
on the switch box. Since capacitors may still be charged even after the input side
power sources are turned off, make sure that the operation is conducted after
checking that there is no voltage charged.