IEC Electrical Safety Practices 2

Question 1

When working on energized electrical equipment, which OSHA standard specifically governs electrical safety for general industry?

Accepted Answer

29 CFR 1910.333

Answer

OSHA 29 CFR 1910.333 covers safety requirements for working on or near live parts in general industry electrical installations.

Question 2

What is the minimum approach distance for a qualified worker working on uninsulated 4kV conductors?

Accepted Answer

2 feet 2 inches

Answer

NFPA 70E Table 130.4(D)(a) specifies a minimum approach distance of 2 feet 2 inches for uninsulated conductors at 4.0 kV.

Question 3

Which type of glove is rated for use on circuits up to 26,500 volts AC?

Accepted Answer

Class 2

Answer

Class 2 rubber insulating gloves are rated for use on circuits up to 17,000 volts AC (proof-tested to 20,000V), while Class 3 covers up to 26,500V.

Question 4

An arc flash boundary is the distance at which an unprotected worker would receive a second-degree burn from an arc flash incident energy of:

Accepted Answer

1.2 cal/cm²

Answer

The arc flash boundary is defined as the distance at which incident energy equals 1.2 cal/cm², the threshold for a just-curable second-degree burn.

Question 5

What does the term 'qualified person' mean in the context of electrical safety per OSHA standards?

Accepted Answer

A person trained and knowledgeable in construction and operation of electrical equipment and hazards

Answer

OSHA defines a 'qualified person' as one trained and knowledgeable about the construction and operation of equipment and the hazards involved.

IEC - Independent Electrical Contractors Practice Test