Clarke 20CI, Operation & Maintenance Instructions Manual

5

SAFETY RULES AND GENERAL WARNINGS

INTRODUCTION

Your plasma cutting unit is fitted with sophisticated safeguards which block 
functioning and therefore the cutting operations until all the safety conditions 
are present. The plasma cutting technique requires dangerously high voltage 
for pilot arc starting and during cutting, therefore the following safety rules 
must be observed with great care.

ELECTRICITY

1. Make sure that the unit is earthed and that the supply line has an 

adequate earth connection.

2. Make sure that the work bench has a satisfactory earth connection.

3. Avoid contact between the metal bars being cut and bare skin or damp 

clothes.

4. Do not lean on the piece being cut or hold it in your hands.

5. Do not use in damp environments or on wet surfaces.

6. Do not use the unit if the torch or cables appear damaged.

7. Always turn the unit off before replacing the electrode, the nozzle or the 

spreader tip of the torch.

8. Always switch the unit off and remove the power cable from the mains 

socket before carrying out any maintenance on the unit.

CAUTION: IF DURING THE CUTTING OPERATION A SLIGHT ELECTRIC 
SHOCK IS FELT, STOP WORK IMMEDIATELY AND DO NOT USE THE UNIT 
UNTIL THE FAULT HAS BEEN DISCOVERED AND RESOLVED.

CUTTING FUMES AND GASES

Harmful fumes and metallic powders are produced during the cutting 
operation. Metals which are painted or coated or which contain mercury, 
cadmium, zinc, lead and graphite may produce harmful concentrations of 
toxic fumes during cutting.

To protect the operator or other persons from exposure to possible toxic fumes, 
fume respirators should be worn and work areas should be adequately 
ventilated.