NEBOSH CC Electrical Hazards on Site 3

Question 1

What is the most common cause of electric shock on construction sites?

Accepted Answer

Contact with damaged or poorly maintained electrical equipment

Answer

The most common cause of electric shock on construction sites is contact with damaged or poorly maintained electrical equipment, including damaged cables, faulty tools and inadequate insulation. Regular inspection and maintenance are critical.

Question 2

What is an 'arc flash' hazard in electrical safety?

Accepted Answer

An intense release of heat and light energy caused by an electrical arc between conductors

Answer

An arc flash is an extremely dangerous event involving an intense burst of heat (reaching thousands of degrees), light and pressure caused by an electrical arc between conductors. It can cause severe burns, fire and blast injuries.

Question 3

Why must combustion engines not be used in enclosed spaces on construction sites?

Accepted Answer

They produce carbon monoxide, which is a colourless, odourless toxic gas

Answer

Combustion engines (including petrol and diesel generators) produce carbon monoxide as a combustion byproduct. Carbon monoxide is colourless, odourless and highly toxic — it can build up in enclosed spaces and cause rapid unconsciousness and death.

Question 4

What is the recommended frequency for formal inspection of electrical equipment used on a construction site?

Accepted Answer

Before first use and at regular intervals based on the type and use of equipment

Answer

The frequency of electrical equipment inspection should be based on the type of equipment, how often it is used and the conditions of use. On construction sites, equipment may need inspection before each use due to harsh conditions.

Question 5

What is a 'permit to work' system used for in electrical work?

Accepted Answer

To formally control and authorise electrical work, ensuring isolation and safe conditions before work begins

Answer

A permit to work for electrical work formally controls who can work on electrical systems, ensures proper isolation has been carried out, specifies the work to be done and authorises only competent persons to proceed. It prevents accidental re-energisation.

NEBOSH Construction Certificate Practice Test

NEBOSH Construction Certificate Practice Test

NEBOSH CC Electrical Hazards on Site 3