Underground Cable Quiz

What abbreviation is used for cross-linked polyethylene cable insulation?

• EPR

• EVA

• PVDF

• XLPE

What is most commonly used to compensate for a subsidence in underground cabling?

• Thermosetting cable insulation

• Reduction in burial depth

• Larger conductors

• An expansion joint

What is the main reason that underground cables are generally larger than their current carrying requirements need?

• To reduce mutual inductance

• To increase voltage drop

• To account for heat generated

• To increase capacitive reactance

Which underground cable property is directly affected by cable spacing?

• Mechanical protection

• Conductor resistivity

• Corrosion resistance

• Heat dissipation

Which Health and Safety Guidance document specifically relates to avoidance of danger from underground services?

• HSG28

• HSG33

• HSG47

• HSG51

What is the main benefit of keeping underground cable location records and data?

• Cable fault types can be more easily identified

• The risk of danger from future maintenance and work is reduced

• Relevant substation load variations can be accurately measured

• Cable condition can be visually monitored more easily

Which legislation requires a supplier of electricity to keep a current map indicating the depth and position of all their works?

• Electricity at Work Regulations 1989

• The Construction (Design and Management) Regulations 2015

• New Roads and Street Works Act 1991

• Electricity Safety, Quality and Continuity Regulations 2002

What is the correct interpretation of cable information recorded on a cable plan as '3 x 1c Cu 500 XLPE 132 kV'?

• 3 times 1 centimetre, 500 ampere line, unsheathed 1320 V cable

• 3 core plus 1 core 500 ampere line, lead sheathed 132000V cable

• 3 core 500 mm², aluminium, sheathed 1320 V cable

• 3 single cores, 500 mm², copper, sheathed 132000 V cable

What are specifically used to facilitate extension of underground HV transmission cable systems?

• Cut and cover tunnels

• Stop joints

• Joint bays

• Surface troughs

What is used in underground jointing operations to ensure earth continuity is maintained during works?

• Hermetic sealing

• Equipotential bonding

• Supplementary bonding

• Safe isolation