Site Safe Electrical Safety on Construction Sites 3

Question 1

What is the standard single-phase mains voltage in New Zealand?

Accepted Answer

230V AC

Answer

110V AC

Answer

220V AC

Answer

240V AC

Question 2

What does 'double insulation' mean when it is marked on a power tool?

Accepted Answer

The tool has two independent insulation barriers between live parts and the user

Answer

The tool has two layers of rubber outer casing

Answer

The tool is fully waterproof for outdoor use

Answer

The tool has been electrically tested twice

Question 3

Under the Health and Safety at Work Act 2015, who holds the duty to manage electrical risks on a construction site?

Accepted Answer

All PCBUs with management or control of the worksite

Answer

Only the principal contractor

Answer

Only Licensed Electrical Workers on site

Answer

Only the site owner or developer

Question 4

How close to a located underground cable can you continue to use mechanical excavation equipment?

Accepted Answer

Up to 300mm from the cable

Answer

Up to 100mm from the cable

Answer

Up to 500mm from the cable

Answer

Up to 1 metre from the cable

Question 5

What must happen before a crane or elevated work platform operates near overhead power lines?

Accepted Answer

Stop work and contact the network operator to arrange isolation or line protection

Answer

Proceed if the operator is experienced and uses a spotter

Answer

Reduce the operating speed of the plant near the lines

Answer

Mark the lines with coloured tape so the operator can see them

Question 6

What must temporary construction site power boards (spider boards) include to protect workers in NZ?

Accepted Answer

RCD protection on all outlets

Answer

A voltage converter to reduce supply from 230V to 110V

Answer

A lockable enclosure to prevent unauthorised access

Answer

A separate earth stake driven into the ground

Question 7

Which statement about electrical safety reporting on NZ construction sites is CORRECT?

Accepted Answer

All electrical incidents and near misses must be reported to the site supervisor

Answer

Only incidents involving injury need to be reported to the supervisor

Answer

Any worker can remove an expired test tag and continue using the equipment

Answer

Battery-powered tools do not require any safety inspection