In a TN-S earthing arrangement what should be the size of the cpc connected to the SWA

 

• 10mm²

• 20mm²

• 8mm²

• 16mm²

Identify the factor for a 2.5mm squared stranded conductor to be installed in a short straight length of conduit

• 43

• 70

• 39

• 30

What does SELV stand for?

• Single extraneous low voltage

• Stranded expedited limited voltage

• Separated Extra Low Voltage

• Supplied extra limited voltage

How do we calculate It

• It≥   In

   Ca Cg Ci Cf

• It=Ca X Cg

• It=Ib X In

• It=Ze X Zs

A single phase lighting circuit is to supply 1.3KW via ‘single core’ copper conductors with 70 degrees Celsius thermoplastic insulation installed in conduit. Cable is installed in a thermally insulated wall for the entire length. Circuit is grouped with another identical circuit. A BS 88-2 fuse is used and the circuit length is 36 metres long. CSA is 2.5mm squared. Calculate the volt drop.

• 3.6

• 3.8

• 3.7

• 5.2

What does a C1 observation mean?

• Minimal danger

• Potentially dangerous

• Danger present. Risk of injury. Immediate remedial action required.

• Further investigation required without delay

What page is used to find the Ambient temperature?

• 157

• 168

• 167

• 183

What is the cable factor for a conductor csa of 16mm2

• 145

• 16

• 105

• 217

What page contains the protective devices?

• Page 67

• Page 168

• Page 74

• Page 84

What page has the SPDs on the supply side of an RCD?

• Page 49

• Page 48

• Page 46

• Page 47