Measuring and marking out

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Aims and objectives of this sessionTo be able to state the purpose and use of equipment for measuring and marking out• To be able to recognise and use rules, tapes, gauges, levels, plumbs, squares

and scribes.• To be able to state methods for measuring, marking out and fixing installation

equipment.

Describe methods of undertaking electrical installations systems and components.

Measuring and marking out

Before starting any installation an assessment of the site needs to be done.

Risk assessment, safe storage, access to PPE and suitable access equipment for the installation needs to be taken into account before starting work.

It is important to be able to communicate and have good working relationships with many different people.

Tools and equipment needs to be checked and stored safely and securely.

Isolation procedures and equipment is a key component to working safely.

Measuring and Marking Out

Stainless steel rule

The steel end piece is deliberatelymade adjustable to enable internaland external measurements to betaken without loss of accuracy

These are some of the most common types of tapes for measuring.

Standard tape measure

Tape measure with built in calculator

Laser measurer

Engineers square

Measuring and Marking Out

0.5

1.0

1.5

2.5

4.0

6.0

10.0

16.0

Gauge used to measure aconductor having a c.s.aof 2.5 mm2

Conductor

Cable Gauge

Simple internal and external callipers for measuring the diameter of tubing.

Simple gauge for determining the cable size

Levels Water level

This uses the principle of water always finding its own level

Spirit levels come in a variety of sizes.

Making sure two switches are level using a straight edge

Optical Level

Plumb LinesA plumb line is a length of string with a weight attached to the end of it.

Self-Levelling plumb bobs

Additional Marking Out Tools

Squares Used for marking out conduit trunking and tray work.

Centre punchUsed before drilling

Scriber used to score the surface of metal

Compass used to mark circles or to find the centre of something.

Toolbox

1. Those for common use:- Pliers- insulated,

wire crimps

Long nosed pliers

Side cutters (snips), wire strippers

Screwdrivers –terminal, socket driver, selection of larger screwdrivers

Voltage tester/indicator – proving unit – multimeter

Large hacksaw and Junior hacksaw

Knife

Hammers – claw, lump, clipping and soft mallet

Tape measure – spirit level, combination square

Plumb lines

Tools fall into two categories

Toolbox2. Occasional use Selection of wood chisels Cold chisels, combing chisel, flooring chisel (flat headed) Tenon saw Large spirit level MI MS tools Stillsons (10/12”) Pipegrips (footprints) Spanners, Allen keys Stocks and dies Small socket set Spanners for conduit fittings Selection of masonry, wood and steel drill bits Torch with spare batteriesAll of these are useful to have at hand.

Toolbox Sundry items:- Electricians tape Earth sleeving Conduit box brass screws Selection of longer accessory plate fixing screws Selection of cartridge/HRC fuses MIMS compound (comes in useful for all sorts of things) Selection of small nuts and bolts Selection of flat washers (for fixing earth wires when bonding. Selection of crimp on terminals Conduit male and female bushes Tie wraps

The list is endless and would depend on your particular electrical speciality, but the above is what you would find the average sparks carrying in a separate box , usually one that has a number of segregated sections in.

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