INSTALLATION WIRING SYSTEMS ENCLOSURES - Pearson Schools

Chapter 4: Installation of wiring systems and enclosures
Tool Check for: Optimum performance PPE and other safety advice
Jig saw
• Damaged lead and plug
• Damaged insulation
• General damage
• Faulty on/off switch/trigger
• Loose blade clamping screws
• Do not use worn blades.
• Use the right blade for the material.
• If possible use a guide to keep the
saw on the cutting line.
• Eye protection
• Gloves
• Ear protectors
• Secure the workpiece
• Always cut away from yourself
Chapter
4
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Circular saw
Table 4.7: Using saws safely
Type of hammer
Claw hammer
Ball pein hammer
Lump hammer
Scutching hammer
Mallet
Table 4.8: Different types of hammer
• Damaged lead and plug
• Damaged insulation
• General damage
• Faulty on/off switch/trigger
• Check guard is in place and
working properly.
Use
• Do not use worn blades.
• Use the right blade for the material.
• Use a guide to keep the saw on the
cutting line.
Hammers
The hammer is probably the most basic item in the electrician’s toolbox and
is used for a wide variety of jobs, such as knocking in nails and driving a
chisel through masonry or wood. Hammers are generally graded according
to the weight of their head.
The claw hammer is two tools in one. The hammer face is
used for general work and the claw is used for removing
unwanted nails and other levering tasks. To remove a nail,
the head is gripped between the two blades of the claw and
the top of the hammer used as the fulcrum of a lever action.
Like the claw hammer, the ball pein is a combination tool
with a standard striking face and a rounded second face.
The ball pein was originally designed for driving in rivets.
1st Proof
Lump hammers are a heavy, block-headed tool usually used
in combination with a cold chisel. This is a heavy tool so
make sure you select a weight that is comfortable. A large
two-handed version of the lump hammer is the sledge
hammer, used for breaking up concrete and for general
demolition type work.
Used by electricians for cutting chases, the scutching
hammer has replaceable blades or teeth that fit into each
end of its head.
The mallet can be either wood or a nylon type head. Mallets
are used mainly in combination with wood chisels. The
softer versions are also used for dressing cables, particularly
mineral insulated, although they must be used with care
when carrying out this type of job because striking the
cable too hard could damage or misshape its outer sheath.
• Eye protection
• Gloves
• Ear protectors
• Secure the workpiece
• Always cut away from yourself
if using a hand-held version
Progress check 4.2
1 Why is a retractable bladed
knife a safe option for the
electrician?
2 In which direction should
the teeth of a hacksaw
blade face?
3 What type of saw is used
for cutting holes in
plasterboard walls?
!
Safe working
Always remember the following
safety guidelines.
• Never use a hammer if the
head is loose.
• Do not use if the handle is
cracked or greasy.
• Check the impact face of a
hammer – if the edges are
cracked or curled back, do
not use.
• Wear gloves and eye
protection when using a
hammer – nails can break off or
fly out if mishit.
Unit
GH8
169