LV Cable Installation Safety

Low voltage (LV) cable installation supplies 230V and 400V power from substations to buildings and street furniture.
LV cables carry sufficient energy to cause fatal electrocution and severe arc flash burns.
Cable pulling through ducts requires winches, cable rollers, and lubricant — pinch point and crush risks are present.
Cable drums are extremely heavy, typically weighing several tonnes, and must be handled with lifting equipment.
Jointing LV cables requires trained and competent cable jointers using approved materials and techniques.
Trenching for direct-buried LV cables creates standard excavation hazards including collapse and service strikes.
The Electricity at Work Regulations 1989 require all electrical work to be carried out by competent persons.
LV cables near existing HV infrastructure require careful identification to prevent contact with HV circuits.
Testing and commissioning of newly installed LV cables must confirm insulation resistance and continuity before energisation.
Cable routes must avoid areas prone to future disturbance and be recorded on as-built drawings.

Prevent electrocution	LV cables carry lethal voltages — incorrect handling, damage, or working on live circuits causes fatal shock.
Crush and strain injury	Cable drums and pulling operations involve heavy loads creating crush, pinch, and musculoskeletal hazards.
Legal compliance	The Electricity at Work Regulations 1989 require competent persons and safe systems for all cable installation work.

Do

Don't

Ensure all cable installers hold relevant competency certification for LV cable work
Use rated lifting equipment for handling cable drums and never roll drums on soft ground
Install cable rollers and guides at duct entries to prevent cable damage during pulling
Wear appropriate gloves to prevent hand injuries from cable, duct edges, and pulling equipment
Identify and mark all existing services in the cable trench route before excavation
Test cable insulation resistance and continuity before any energisation takes place
Complete all jointing work to manufacturer specifications using approved materials only
Record the as-built cable route accurately for inclusion in utility records and drawings
Use LOTO procedures to isolate supply points before connecting newly installed cables
Brief the team on the cable route, pulling plan, and emergency procedures before starting

DON'T work on LV cables without confirming isolation and proving the circuit is dead
DON'T stand in the cable pulling line where a snapped cable could whip and cause injury
DON'T use damaged cables or drums with compromised outer sheaths for installation
DON'T exceed the cable's minimum bending radius during pulling, routing, or coiling
DON'T energise newly installed cables without completed insulation and continuity testing
DON'T confuse LV and HV cables — always confirm cable identification before any work
DON'T allow unqualified persons to make cable joints or terminations on LV circuits
DON'T leave cable ends exposed in open trenches where they could contact water or soil
DON'T pull cables through ducts without lubrication — this damages the cable sheath
DON'T leave cable drum lifting equipment unsecured when not in active use on site

See also: HV Cable Installation Safety | Cable Jointing Safety (HV and LV)

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