Subpart S Electrical Standards General Industry
65 flashcards covering Subpart S Electrical Standards General Industry for the OSHA OSHA 10/30 General Industry section.
Subpart S of OSHA's 29 CFR 1910 sets the electrical safety standards for general industry, covering essential areas like wiring methods, grounding, and protection against hazards such as electric shock, fires, and explosions. This regulation ensures workers in settings like manufacturing and warehouses follow practices to maintain safe electrical systems, defined by the Occupational Safety and Health Administration as part of their broader rules for general industry under OSHA 10/30 training.
On OSHA certification exams, this topic typically appears in multiple-choice questions that test recall of specific standards, such as proper use of lockout/tagout or identifying unsafe wiring. A common trap is confusing requirements for different voltage levels, leading to errors in applying the right safety measures.
Always verify that electrical equipment is de-energized before maintenance to avoid accidental exposures.
Terms (65)
- 01
What is a qualified person under Subpart S?
A qualified person is one who has training in and practical knowledge of the electrical hazards involved and the skills to work safely on or near exposed energized parts (29 CFR 1910.399).
- 02
Under 29 CFR 1910.303, how must live parts be protected?
Live parts operating at 50 volts or more must be guarded against accidental contact using approved cabinets, enclosures, or guards (29 CFR 1910.303(g)).
- 03
What must employers provide for employees working on electrical equipment?
Employers must provide necessary equipment and training to ensure employees can work safely, including appropriate personal protective equipment (29 CFR 1910.335).
- 04
How often must electrical protective devices be tested?
Electrical protective devices must be tested or calibrated at intervals that ensure proper maintenance, as specified by the manufacturer or standard practice (29 CFR 1910.304(b)).
- 05
Under Subpart S, what is required for wiring in hazardous locations?
Wiring in hazardous locations must be installed according to the requirements for the specific class and division to prevent ignition of flammable substances (29 CFR 1910.307).
- 06
What should be done if electrical equipment is damaged?
Damaged electrical equipment must be removed from service and not used until repaired and inspected to ensure it is safe (29 CFR 1910.303(b)(1)).
- 07
Under 29 CFR 1910.305, what must protect conductors?
Conductors must be protected from physical damage by conduits, enclosures, or other means in areas where they are exposed to damage (29 CFR 1910.305(b)).
- 08
What training is required for employees exposed to electrical hazards?
Employees must receive training in the recognition and avoidance of electrical hazards, including safe work practices and emergency procedures (29 CFR 1910.332).
- 09
Under Subpart S, what is the minimum clearance for working near overhead lines?
A minimum clearance of 10 feet must be maintained from overhead power lines operating at 50 kV or below, with increased distances for higher voltages (29 CFR 1910.333(c)(3)).
- 10
What must be used to identify electrical conductors?
Electrical conductors must be identified by color, marking, or tagging at all points of access to indicate their purpose or voltage (29 CFR 1910.303(f)).
- 11
How must flexible cords be used according to Subpart S?
Flexible cords must be used only for temporary wiring and must be approved for hard usage or extra-hard usage, and not run through walls or ceilings (29 CFR 1910.305(a)(2)).
- 12
Under 29 CFR 1910.334, what precautions are needed for energized parts?
Employees must treat all potentially energized parts as energized until verified otherwise, using appropriate testing tools (29 CFR 1910.334(a)).
- 13
What is required when using portable electric equipment?
Portable electric equipment must be handled in a manner that prevents strain on cords and plugs, and it must be visually inspected before use (29 CFR 1910.334(b)).
- 14
Under Subpart S, what must protect against electric shock?
Ground-fault circuit interrupters must be used to protect employees from electric shock in wet or conductive work areas (29 CFR 1910.304(b)(3)).
- 15
What documentation is needed for electrical installations?
Electrical installations must be documented with diagrams, specifications, or records to ensure compliance and safe maintenance (29 CFR 1910.303(a)).
- 16
A worker notices arcing on electrical equipment. What should they do?
The worker should immediately de-energize the equipment if possible and report the hazard to a supervisor for inspection and repair (29 CFR 1910.334(c)).
- 17
Under 29 CFR 1910.306, what is required for elevators and escalators?
Elevators and escalators must have electrical equipment installed and maintained to prevent hazards, including proper guarding of live parts (29 CFR 1910.306(e)).
- 18
How must electrical panels be maintained?
Electrical panels must be kept clear of obstructions with at least 36 inches of clear space in front for safe access and operation (29 CFR 1910.303(g)(1)(i)).
- 19
What is the first step before performing maintenance on electrical circuits?
The first step is to de-energize the circuit and verify it is de-energized using appropriate testing equipment (29 CFR 1910.333(b)).
- 20
Under Subpart S, what personal protective equipment is needed for electrical work?
Appropriate PPE such as insulated gloves and clothing must be used based on the voltage and hazard level to protect against shock and burns (29 CFR 1910.335(a)).
- 21
What must be done with unused openings in electrical enclosures?
Unused openings in electrical enclosures must be closed with appropriate covers or plugs to maintain the enclosure's integrity (29 CFR 1910.303(e)).
- 22
A worker is working near live parts. What safety measures are required?
The worker must use insulated tools and barriers, and maintain safe distances to prevent accidental contact (29 CFR 1910.333(c)).
- 23
Under 29 CFR 1910.308, what is required for emergency systems?
Emergency systems like exit lighting must be installed to ensure reliable operation during power failures (29 CFR 1910.308(d)).
- 24
How often must electrical safety training be provided?
Electrical safety training must be provided when the employee is first assigned duties and whenever new hazards are introduced (29 CFR 1910.332(b)).
- 25
What is required for grounding electrical systems?
Electrical systems must be grounded to limit voltage to ground and facilitate overcurrent protection (29 CFR 1910.304(f)).
- 26
Under Subpart S, what must be labeled on electrical equipment?
Electrical equipment must be labeled with its voltage, current, and circuit details for safe operation and maintenance (29 CFR 1910.303(f)).
- 27
Before entering a manhole with electrical hazards, what must be done?
The area must be tested for hazards, de-energized if possible, and ventilated before entry (29 CFR 1910.146 in conjunction with Subpart S practices).
- 28
What is the definition of a de-energized circuit under Subpart S?
A de-energized circuit is one that has been disconnected from its energy source and verified as having zero energy (29 CFR 1910.399).
- 29
Under 29 CFR 1910.335, what must protect against arc flash?
Employees must use arc-rated clothing and equipment when there is a risk of arc flash exposure (29 CFR 1910.335(a)(2)).
- 30
How must extension cords be used in the workplace?
Extension cords must be of the proper rating for the equipment and not used as permanent wiring, with regular inspections (29 CFR 1910.305(a)(2)(ii)).
- 31
A worker feels a tingling sensation from equipment. What should they do?
The worker should immediately stop using the equipment, report it, and have it inspected for grounding issues or faults (29 CFR 1910.334(a)).
- 32
What is required for overcurrent protection devices?
Overcurrent protection devices must be selected and coordinated to protect the circuit and equipment from excessive current (29 CFR 1910.304(b)).
- 33
Under Subpart S, what must be done with temporary wiring?
Temporary wiring must be removed immediately upon completion of the work or at the end of a 90-day period, whichever is less (29 CFR 1910.305(a)(3)).
- 34
What training elements are needed for unqualified persons?
Unqualified persons must be trained in electrical hazards related to their work and how to avoid them in their environment (29 CFR 1910.332(b)(3)).
- 35
Under 29 CFR 1910.303, what spacing is required for live parts?
Adequate spacing must be maintained between live parts of opposite polarity to prevent short circuits (29 CFR 1910.303(c)).
- 36
What must be verified after locking out equipment?
After locking out, the equipment must be tested to ensure it is de-energized and cannot be accidentally energized (29 CFR 1910.333(b)(2)).
- 37
How must electrical hazards be assessed?
Electrical hazards must be assessed by a qualified person to determine the risks and necessary precautions (29 CFR 1910.332(d)).
- 38
A fire starts due to electrical fault. What is the initial response?
Evacuate the area, activate the alarm, and use the appropriate fire extinguisher if trained, while avoiding the hazard (29 CFR 1910.333(c)(5)).
- 39
Under Subpart S, what is needed for circuit breakers?
Circuit breakers must be installed and maintained to protect against overcurrents and be readily accessible (29 CFR 1910.304(f)).
- 40
What documentation is required for electrical safety programs?
Employers must maintain records of training and inspections related to electrical safety (29 CFR 1910.333(a)(1)).
- 41
Before using a ladder near power lines, what must be ensured?
A safe distance must be maintained, and the ladder must be positioned to avoid contact with lines (29 CFR 1910.333(c)(3)).
- 42
What is the role of a ground-fault circuit interrupter?
It must interrupt the circuit if a ground fault is detected to prevent electrocution (29 CFR 1910.304(b)(3)(i)).
- 43
Under 29 CFR 1910.331, who can work on energized parts?
Only qualified persons can work on or near exposed energized parts (29 CFR 1910.331).
- 44
How must electrical tools be stored?
Electrical tools must be stored in a dry, clean location to prevent damage and exposure to hazards (29 CFR 1910.334(b)).
- 45
What must be done if an electrical cord is frayed?
The cord must be removed from service and repaired or replaced before further use (29 CFR 1910.334(a)(3)).
- 46
Under Subpart S, what protects against voltage backfeed?
Proper isolation and locking devices must be used to prevent voltage backfeed during maintenance (29 CFR 1910.333(b)).
- 47
What is required for high-voltage equipment?
High-voltage equipment must have warning signs and be accessed only by qualified persons (29 CFR 1910.303(f)).
- 48
A worker is assigned to troubleshoot live equipment. What must precede this?
A risk assessment must be conducted, and proper PPE must be worn (29 CFR 1910.335(a)).
- 49
Under 29 CFR 1910.305, what must secure wiring methods?
Wiring methods must be securely fastened and supported to prevent strain and damage (29 CFR 1910.305(b)).
- 50
What inspection is needed for electrical PPE?
Electrical PPE must be inspected before each use and after any incident that could affect its integrity (29 CFR 1910.335(b)).
- 51
How must warning labels be placed on equipment?
Warning labels must be placed on equipment to indicate hazards like high voltage (29 CFR 1910.303(f)).
- 52
What is the procedure for re-energizing equipment?
Equipment must be inspected, guards replaced, and employees notified before re-energizing (29 CFR 1910.333(b)(4)).
- 53
Under Subpart S, what must be in a safety-related work practice program?
The program must include training, hazard assessment, and use of PPE (29 CFR 1910.331-335).
- 54
What must employers do for arc flash hazards?
Employers must assess for arc flash hazards and provide appropriate protection (29 CFR 1910.335(a)(1)(ii)).
- 55
How must electrical enclosures be maintained?
Enclosures must be kept closed and secured to prevent unauthorized access (29 CFR 1910.303(e)).
- 56
What is required when multiple workers are near energized parts?
A system of barriers or attendants must be used to protect workers from contact (29 CFR 1910.333(c)(7)).
- 57
Under 29 CFR 1910.304, what must protect against short circuits?
Fuses or circuit breakers must be used to protect against short circuits and overloads (29 CFR 1910.304(b)).
- 58
What training is needed for lockout/tagout with electrical hazards?
Employees must be trained on the lockout/tagout procedures specific to electrical energy sources (29 CFR 1910.147 in relation to Subpart S).
- 59
How must portable generators be grounded?
Portable generators must be grounded as specified to prevent electrical shock hazards (29 CFR 1910.304(f)).
- 60
What must be done with abandoned wiring?
Abandoned wiring must be removed or disconnected and sealed to prevent hazards (29 CFR 1910.305(j)).
- 61
Under Subpart S, what is the key to preventing electrical incidents?
Following safe work practices and using proper equipment as outlined in the standards (29 CFR 1910.331-335).
- 62
What must be included in an electrical safety audit?
The audit must check for compliance with installation, maintenance, and training requirements (29 CFR 1910.303).
- 63
A worker encounters an unlabeled breaker. What should they do?
The worker should not operate it and report it for proper labeling and assessment (29 CFR 1910.303(f)).
- 64
Under 29 CFR 1910.333, what controls energy sources?
Energy sources must be controlled through lockout/tagout procedures to prevent accidental startup (29 CFR 1910.333(b)).
- 65
What is the purpose of electrical bonding?
Electrical bonding equalizes potential between conductive parts to prevent shock (29 CFR 1910.304(g)).