IMSA Electrical Safety & Lockout/Tagout

Question 1

According to OSHA 29 CFR 1910.147, which step must be completed FIRST when performing lockout/tagout on energy-isolating equipment?

Accepted Answer

Notify affected employees of the shutdown

Answer

Apply the lockout device to the energy source

Answer

Verify that the equipment is de-energized

Answer

Release any stored energy

Question 2

What is the minimum approach distance for qualified electrical workers working on unguarded, energized parts operating at 50 volts in the US?

Accepted Answer

No minimum distance required; insulated tools must be used

Answer

Avoid contact — no specified air gap at 50V

Answer

1 foot clearance required

Answer

3 feet clearance required

Question 3

Under OSHA's Control of Hazardous Energy standard, who is authorized to remove a lockout/tagout device?

Accepted Answer

Only the employee who applied the device

Answer

Any supervisor on site

Answer

The safety officer

Answer

Any qualified electrician

Question 4

Which of the following is classified as an 'energy-isolating device' under OSHA 1910.147?

Accepted Answer

A manually operated disconnect switch

Answer

A control button that de-energizes equipment

Answer

An electronic interlock

Answer

A software-based shutdown command

Question 5

What type of inspection does OSHA 1910.147 require for energy control procedures at least annually?

Accepted Answer

A documented periodic inspection of each procedure

Answer

A quarterly audit by an outside contractor

Answer

A monthly self-certification by the employee

Answer

A biennial review by OSHA compliance officers

Question 6

In electrical safety, what does the term 'arc flash boundary' refer to?

Accepted Answer

The distance at which an arc flash could cause a second-degree burn to unprotected skin

Answer

The zone where all electrical work is prohibited

Answer

The maximum distance a worker must stand from any panel

Answer

The boundary requiring full arc-rated PPE regardless of energy level