NABCEP - Certified North American Board of Certified Energy Practitioners Specialist Workplace Safety and OSHA Questions and Answers

Question 1

According to OSHA standard 1926 Subpart M, personal fall arrest systems or guardrails are required when solar installers are working on a low-slope roof with an unprotected side or edge that is how many feet or more above a lower level?

Accepted Answer

6 feet

Answer

OSHA's standard for construction, 29 CFR 1926.501(b)(1), mandates that fall protection (such as a personal fall arrest system, safety net, or guardrail system) must be used when employees are on a walking/working surface with an unprotected side or edge that is 6 feet or more above a lower level.

Question 2

A solar technician is preparing to perform maintenance on a grid-tied string inverter. According to OSHA's Lockout/Tagout (LOTO) standard (29 CFR 1910.147), which of the following is a critical first step in the LOTO procedure?

Accepted Answer

Notify all affected employees of the impending shutdown.

Answer

The OSHA Lockout/Tagout standard requires that before equipment is shut down, the authorized employee must notify all affected employees that a LOTO procedure is about to begin. This ensures everyone in the area is aware of the service and does not attempt to re-energize the equipment. While all other steps are part of the process, notification is the initial preparatory step.

Question 3

Within OSHA's Hierarchy of Controls, which of the following is considered the LEAST effective method for protecting workers from hazards and should be relied upon only after other controls have been implemented?

Accepted Answer

Personal Protective Equipment (PPE) (e.g., wearing a hard hat)

Answer

The OSHA Hierarchy of Controls ranks hazard control methods from most to least effective. Personal Protective Equipment (PPE) is at the bottom of the hierarchy, meaning it is the last line of defense. The most effective controls are Elimination and Substitution, followed by Engineering Controls, then Administrative Controls, and finally PPE.

Question 4

An installer is using a portable extension ladder to access a flat commercial roof for a site survey. To comply with OSHA standard 1926.1053, the side rails of the ladder must extend at least how far above the upper landing surface?

Accepted Answer

3 feet

Answer

OSHA standard 29 CFR 1926.1053(b)(1) explicitly states that when a portable ladder is used for access to an upper landing surface, the ladder's side rails must extend at least 3 feet (0.9 m) above that surface to provide a secure handhold for employees mounting and dismounting the ladder.

Question 5

An installer is working on a rooftop PV array where the inverter and all disconnects have been shut off. However, the conductors between the modules are still exposed to sunlight. According to OSHA's electrical safety principles, how must these conductors be treated?

Accepted Answer

As energized, until tested and proven to be de-energized.

Answer

A fundamental principle of electrical safety under OSHA (e.g., 1910.333 and 1926.960) is to treat all electrical circuits as energized until they are tested and verified to be de-energized. PV source circuits are energized by sunlight, even when disconnected from the inverter, and pose a significant shock hazard. A qualified person must use proper test equipment to verify a zero-energy state before direct contact.

(NABCEP) Certified North American Board of Certified Energy Practitioners Specialist Practice Test

(NABCEP) Certified North American Board of Certified Energy Practitioners Specialist Practice Test

NABCEP - Certified North American Board of Certified Energy Practitioners Specialist Workplace Safety and OSHA Questions and Answers