Cable selection EAL DI U4

Which cable is used as a control cable?

• CY

• SWA

• PVC/PVC flat

• Fire resistant

Which of the following impacts on the choice of cable and enclosure

• All of these

• UV exposure

• Animals

• Aesthetics

D&D calculations for domestic properties' socket circuits require:

• careful calculation of expected loads to determine correct cable and OCPD

• the use of table A1 to estimate the load, to determine the correct load

• the use of table H1 to determine the choice of cable and OCPD

• 2.5mm T&E and a 30A or 32A OCPD

Lighting points with removable lamp units (bulbs) should be assumed to be:

• 15W

• 100w

• 50w

• the expected lamp wattage

An A2 final circuit has what size conductor?

• 1.5mm

• 2.5mm

• 4mm

• 6mm

A radial final circuit in 2.5mm can service how large an area?

• 100m

• 75m

• 50m

• 25m

what should be either 0.725 or 1, when calculating cable carrying capacity?

• Ca

• Cg

• Ci

• Cf

When passing through insulation, at what point is the cable considered to be fully de-rated?

• 100mm

• 200mm

• 400mm

• 500mm

the maximum permitted voltage drop for a lighting circuit is:

• 3%

• 2.5%

• 6.5V

• 11.5V

Zs = Ze + R1+R2. does any of this need to be measured?

• All parts must be measured

• only R1 + R2 needs to be measured

• none need to be. may all be done by calculation or enquiry

• Only combined Zs needs to be measured. components may be calculated