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Public Contract Code §20166 lets an awarding body reject any and all bids, and agencies reserve that right in the call for bids; the usual grounds are that every bid exceeds the budget, that all are nonresponsive, or that rebidding better serves the public. An apprenticeship committee has no voice in the award. The low bidder's consent is not required, because rejection is the agency's decision, not a negotiation. The last option inverts the rule: soliciting bids creates no duty to award a contract.

On a monitored project the records go to the LABOR COMMISSIONER, in electronic format, in the manner prescribed on the department's website, at least once every 30 days while work continues and once more within 30 days of the last day worked. Sending them to the awarding body is not the whole duty. Section 1771.4 sets the penalty for failing to furnish them at $100 per day, not to exceed a total of $5,000 per project. The per-worker, uncapped $100 a day is a different penalty, in §1776(h), for failing to produce records on request.

Section 1813 forfeits $25 for EACH WORKER for EACH CALENDAR DAY on which that worker is required or permitted to work more than 8 hours in a day or 40 hours in a week without the overtime pay §1815 requires. Three workers across four days is twelve worker-days, and twelve times $25 is $300. The forfeiture is counted per worker per day, not per day and not per overtime hour, and it is separate from the wages still owed. The $200 figure is the ceiling in §1775 for underpaying the prevailing wage, which is a different violation.

Civil Code §9550 requires a direct contractor awarded a public works contract involving an expenditure in excess of $25,000 to give a PAYMENT bond before commencement of work, and §9554(a) requires that bond to be executed by an admitted surety insurer. The payment bond exists precisely because public property cannot be liened: it stands behind the workers, subcontractors and suppliers who have no lien to record. A performance bond answers to the awarding body for completion of the work, which is a different promise to a different party.

Civil Code §9356 gives 30 days after recordation of a notice of completion, acceptance or cessation. Recording such a notice SHORTENS the window from 90 days to 30; it never extends it, so April 10 plus 30 days is May 10. Section 9358(a) then makes the duty mandatory rather than discretionary: on receipt the public entity SHALL withhold sufficient funds due or to become due the direct contractor to pay the claim stated in the notice, plus its reasonable cost of any litigation. Six months after the stop-notice period closes is the separate deadline for an action on the payment bond.

Labor Code section 6401.7 and section 3203 require EVERY California employer to establish, implement and maintain a written injury and illness prevention programme - no exemption by size, by industry or by hazard, which is exactly what makes it the answer here. The other three are real documents whose duty is conditional. A safety data sheet is owed for each hazardous chemical PRESENT, so an employer with none owes none (a). A confined space entry permit is owed only where a permit-required space is actually entered (c). And the Form 300 log carries partial exemptions: employers with ten or fewer employees throughout the previous calendar year, and establishments in certain lower-hazard industries, need not routinely keep it - though every employer still owes the serious-injury report under section 342.

Cal/OSHA compliance officers may inspect workplaces without advance notice at any reasonable time. Employers are generally required to grant entry. An imminent hazard inspection may occur at any time.

Section 1670(a) requires an approved personal fall arrest, fall restraint or positioning system where the work exposes an employee to falling IN EXCESS OF 7 1/2 feet from the perimeter of a structure, unprotected sides and edges, leading edges, shaftways and openings. The other three are real triggers borrowed from rules that sit beside this one, which is why they are so easy to pick. Six feet is the federal general construction figure in 29 CFR 1926.501 and, in California, the residential-type framing figure in section 1716.2(e)(1). Ten feet is the federal supported scaffold trigger. Fifteen feet is the steel erection trigger. Roofing is governed by none of them: section 1670(a) routes roofing operations to section 1730, which on a low-slope roof triggers above 20 feet.

Section 1541.1(a)(1) requires each employee in an excavation to be protected from cave-ins by an adequate protective system - sloping or benching, shoring, or shielding - except where the excavation is made entirely in stable rock, or is less than 5 feet deep and a competent person's examination shows no indication of a potential cave-in. Every wrong answer controls something else. Road plates (a) bridge the trench for traffic and do nothing for the walls. A building department inspection (b) is a permit matter; section 1541(k) puts the inspection on a competent person, daily before each shift. And the spoil pile (c) is the opposite of a protection: section 1541(j)(2) requires it to be kept at least 2 feet back precisely because its weight is a surcharge load that helps bring the wall down.

Section 5157(b) defines a confined space as one large enough to enter and perform assigned work, with limited or restricted means of entry or exit, and not designed for continuous employee occupancy - which is option (c). That is true of every permit-required space and is not what adds the permit. The permit is added by one or more of four conditions: a hazardous atmosphere or the potential for one, a material with the potential for engulfment, an internal configuration that could trap or asphyxiate through inwardly converging walls or a floor sloping to a smaller cross-section, or any other recognised serious safety or health hazard. Neither the size of the opening (b) nor the depth (d) appears in either definition.

The Globally Harmonized System (GHS) requires standardized 16-section Safety Data Sheets (SDS). Cal/OSHA's Hazard Communication Standard (HazCom) aligns with this format.

Cal/OSHA's heat illness prevention standard requires water, shade, and cool-down periods for outdoor workers when temperatures reach 80°F. High-heat procedures kick in at 95°F.

A willful violation is one the employer committed knowingly, intentionally, or with plain indifference to the requirement. It is defined by the employer's state of mind, not by how dangerous the condition was - which is exactly what separates it from (a), the serious class under Labor Code section 6432, and from (c), the repeat class. Option (d) names one common way of PROVING willfulness, since an employer that was told and did nothing is easy to characterise, but a prior warning is evidence rather than the definition: an employer that knows the rule and decides the schedule matters more is willful with or without a letter. Willful and repeat violations carry the highest penalties under section 6429.

Neither the Construction Safety Orders nor the federal standard puts a height or a type limit on scaffold training: section 1637(k)(1) requires erection and dismantling to be performed under the supervision and direction of a qualified person whatever the scaffold, and 29 CFR 1926.454(a) requires each employee who performs work WHILE ON a scaffold to be trained by a person qualified in the subject matter. The three wrong answers each import a limit from somewhere else. Ten feet (a) is the federal trigger for fall protection on a supported scaffold, not for training. Tube-and-coupler scaffolds (c) do carry extra design duties, which is why the type feels special. And (d) is the commonest misconception of the four: training belongs to the people who stand on the platform as much as to the crew that builds it, because the hazards they meet - overloading, missing planks, guardrails removed for a delivery - come after erection.

California requires the employer to furnish and pay for the protective equipment the work demands: Labor Code section 6401 obliges the employer to furnish safety devices and safeguards, and section 5144(c)(4) says so in terms for respirators. Option (b) is the near miss because the exception is real but narrower than stated - it covers NON-SPECIALTY prescription safety eyewear, and everyday clothing and footwear the worker keeps, rather than prescription eyewear as a class; a welding lens ground to a prescription is still on the employer. Options (a) and (c) both leave the worker out of pocket, one at purchase and one at the end of the job, and at no cost to the employee rules out both. Where an employee brings equipment of their own by choice, the employer remains responsible for its adequacy and maintenance.

Section 14300.7 makes a case recordable when the work-related injury or illness results in death, days away from work, restricted work or transfer to another job, medical treatment beyond first aid, loss of consciousness, or a significant injury diagnosed by a physician or other licensed health care professional. Each wrong answer substitutes a different line. First aid (a) is defined by a closed list in (b)(5)(ii) - cleaning and bandaging, non-prescription medication at non-prescription strength, hot and cold therapy, a tetanus immunisation - and by definition never makes a case recordable. A report to a supervisor (b) is how the employer learns of the case and says nothing about its severity. And a workers' compensation claim (c) belongs to a different system with its own thresholds: a case can be recordable with no claim, and claimed without being recordable.

Section 1509(e) requires supervisory employees to conduct toolbox or tailgate safety meetings, or the equivalent, with their crews at least every 10 working days to emphasise safety. The point of the format is that it is short, concrete and tied to the day's work - this trench, this saw, this weather - and that is what option (b) misreads: a tailgate is part of the communication element under section 3203(a)(3), and it does not discharge the training obligations at (a)(7), which attach to hiring, to new assignments and to new hazards. Recording attendance (a) is worth doing and is a by-product rather than the purpose. And production targets (c) are what a tailgate turns into when nobody protects the ten minutes.

The employer's duties come in four parts: a written programme with an inventory of the hazardous chemicals present; labels on every container in the workplace; a safety data sheet for each chemical, readily accessible in the work area during each shift; and training at initial assignment and whenever a new hazard is introduced. Option (b) invents a purchase-date cut-off - the standard covers chemicals PRESENT, whenever they were bought. Option (c) is the misconception worth catching: a list on the break-room wall is neither a label nor an accessible sheet, and access has to be where the work is, not in a room the crew visits twice a day. Option (d) invents a Cal/OSHA filing; the hazardous materials business plan a contractor may owe goes to the local certified unified program agency and is an environmental filing.

Labor Code section 6314 authorises the Division to enter any place of employment at reasonable times to inspect, and section 6309 lets it investigate a complaint. An employer may insist on an inspection warrant, but that is a right to be used advisedly rather than a rule (a): the Division obtains the warrant, little time is saved, and the employer has drawn attention to itself. The employer is entitled to accompany the compliance officer on the walkaround, which is why (b) is the practical answer as well as the lawful one. Clearing the crew (c) removes none of the conditions and obstructs the employee interviews the officer is entitled to conduct privately. And on a multi-employer site the general contractor's consent has no bearing (d): the Division is inspecting this employer's own workplace.

OSHA requires employers to retain injury and illness records (Form 300, 300A, and 301) for five years following the end of the calendar year they cover.

Labor Code §6409.1 requires an employer to report any serious injury, illness, or death of an employee to the nearest Cal/OSHA district office within 8 hours of learning of it.

8 CCR §3203 requires an IIPP to include hazard identification, accident investigation, hazard correction, training, communication, and an assignment of responsibility. A list of bid contracts is unrelated to the IIPP.

Section 3203(a)(7) names six occasions: when the programme is first established; to all new employees; to employees given new assignments for which training has not been received; when new substances, processes, procedures or equipment introduce a new hazard; when the employer is made aware of a new or previously unrecognised hazard; and for supervisors, on the hazards their crews face. Not one of them is a date. An annual refresher (a) is common practice and is neither required nor sufficient, and an injury is not a trigger either - by then the hazard has already found someone. The tailgate meetings in section 1509(e) (c) run at least every 10 working days and satisfy a communication duty, not the training duty. A probationary period (d) appears nowhere in the safety orders.

Section 3203(a)(1) requires the programme to identify the person or persons with authority AND responsibility for implementing it, and both words carry weight: authority without responsibility produces a figurehead, and responsibility without authority produces someone who can see the hazard and cannot spend the money to fix it. Option (a) is the most tempting wrong answer because the qualifying individual under Business and Professions Code section 7068 really is a named person tied to the licence - but that is a trade-competence role, and nothing requires the same person to run the safety programme. Nothing in section 3203 calls for an outside reviewer (c), and the Division never approves a programme in advance (d); it reads the programme during an inspection and cites what is missing.

Labor Code section 6427 defines the general, or non-serious, class: a violation with a direct relationship to occupational safety or health that is not likely to cause death or serious physical harm. The other three are real classes wearing the wrong label. Option (c) is the serious class under section 6432, which turns on a realistic possibility that death or serious physical harm could result from the actual hazard the violation created. Option (b) is the willful class, defined by the employer's state of mind rather than by the danger. Option (d) is the regulatory class, which covers posting, recordkeeping and reporting duties. Keeping them apart matters because the penalty ladder in sections 6427 to 6430 follows the classification exactly.

A repeat violation occurs when an employer is cited for a substantially similar violation within a defined look-back period after a previous final citation. Repeat violations carry substantially increased penalties.

Section 5194(f)(6) requires each container of hazardous chemicals in the workplace to be labelled, tagged or marked with the product identifier and with words, pictures or symbols giving general information about the hazards. An unlabelled container has failed that and nobody on site knows what is in it, so it goes out of use until it is identified. Option (a) misapplies the portable-container exemption at (f)(8), which covers a chemical transferred from a LABELLED container for the immediate use of the employee who performed the transfer, within that work shift - none of which is true of a drum standing in the yard. Option (b) picks an identity to fit a sheet, which is a guess dressed up as compliance. Option (d) writes a category rather than a product identifier and carries no hazard warning at all.

Section 5194(g) puts it on the employer: maintain a safety data sheet in the workplace for each hazardous chemical in use, and ensure that it is readily accessible during each work shift to employees when they are in their work area. The manufacturer does have a duty of its own - to develop the sheet and provide it with the first shipment and again after a significant revision - but it runs to the purchaser, not to the worker on the scaffold. A general contractor coordinating a multi-employer site must make its own sheets available to the other employers and tell them where they are kept, under (e)(2), and that does not absorb each subcontractor's duty for its own chemicals. And a sheet sitting in a supplier's warehouse is not accessible in the work area.

Section 1532.1(d) requires an initial determination of whether any employee may be exposed at or above the action level of 30 micrograms per cubic metre, and until that determination is complete the employer must treat the listed trigger tasks as presumed overexposures and supply interim protection: respirators, protective clothing, change areas, washing facilities, training and initial biological monitoring. Option (a) reverses that - the protection is not something added once a monitoring result comes back. Option (b) is an environmental notification and protects nobody on the crew. Option (d) borrows the one-percent-by-weight figure that defines lead-based paint for housing purposes; this standard turns on what is in the AIR, and a coating below that concentration can still put a worker over the limit once it is burned, blasted or sanded.

Thermal system insulation and surfacing material in a building put up no later than 1980 are presumed asbestos-containing material, and the presumption is displaced only by a survey and sampling that meet the standard - or the employer may simply accept it and work to the controls for that class. What it may not do is any of the other three. An owner's assurance (b) is not a survey, and the owner is usually the last person who knows what sits above the ceiling. Wetting down (c) is a control used DURING removal by trained workers inside a regulated area, and not a way of avoiding finding out what the material is. And a permit history (d) records what was abated, not what remains: a 1965 building with one documented abatement may be full of asbestos elsewhere.

A contractor engaging in asbestos-related work involving 100 square feet or more of surface area must be registered with the Division of Occupational Safety and Health under Labor Code section 6501.5, and separately certified by the Contractors State License Board under Business and Professions Code section 7058.5. Option (d) is the near miss: the C-22 Asbestos Abatement classification exists, and holding it does not supply the DOSH registration, which is what the question asks about. The air quality district (c) does require notification before most asbestos demolition and renovation, but that is an environmental filing administered locally under the federal NESHAP programme, not a worker-protection registration. Option (a) is invented: no special bond attaches to asbestos work.

Section 3395(e) lists the high-heat procedures: maintaining effective communication so employees can reach a supervisor; observing employees for alertness and symptoms, by supervisor observation of 20 or fewer employees, a mandatory buddy system, regular contact with a sole employee, or other effective means; designating employees authorised to call emergency medical services; reminding employees throughout the shift to drink plenty of water; and holding a pre-shift meeting to review the procedures. Option (a) is a real rule from the same subsection attached to the wrong industry - (e)(6) gives the ten-minute cool-down rest every two hours to employees in AGRICULTURE, not to construction. Option (c) is the shade duty, which starts above 80 degrees under (d)(1) and is owed long before 95. Option (b) is invented: nothing in the standard caps the working day at any temperature.

Section 3395(d)(1) requires the shade to be open to the air or provided with ventilation or cooling, located as close as practicable to the work, and large enough for everyone on a recovery or rest period to sit in a normal posture fully in the shade without physical contact with one another. The definition in subsection (b) disposes of (a): shade is blockage of direct sunlight, but it is not adequate when the heat in the shaded area defeats the purpose of shade, and the standard's own example is a car sitting in the sun, which does not count unless it is running with air conditioning. There is no fixed distance (b) - 'as close as practicable' adapts to the site. And the capacity is everyone on the break, not a fraction of them (d).

Section 3395(c) requires that, where drinking water is not plumbed or otherwise continuously supplied, enough be provided at the beginning of the work shift for one quart per employee per hour for the entire shift. Six employees times eight hours is 48 quarts, and four quarts make a gallon, so 12 gallons. Forty-eight is that quart figure read as gallons, which is the commonest slip. Six gallons is a gallon a head and loses the hourly rate; eight gallons counts the hours but not the crew. Note the condition in the stem: the employer may begin the shift with a smaller quantity only where it has effective procedures for replenishment during the shift, and this one does not.

Roofing is not governed by §1670. That section covers personal fall arrest, restraint and positioning systems in general construction, and it routes roofing operations to §1730 instead (with §1731 taking over for new production-type residential roofs of 3:12 or steeper). Under §1730(b), on a slope of 0:12 to 4:12 with a single-unit covering, employees must be protected from falls from roofs more than 20 feet high, and the accepted methods include warning lines set back at least 5 feet from the edge with headers, personal fall protection, catch or scaffold platforms, eave barriers, railings, or parapets at least 24 inches high (a). At 28 feet the trigger is met. (b) is wrong because guardrails are one option among several, not the only one, and warning lines with headers are the standard low-slope method. (c) fails §1670(b) and §1730's own equipment rules: body belts are prohibited in a fall ARREST system because of the injuries they cause during arrest, and an anchorage must be rated, not improvised. (d) misstates the trigger — the figure in §1730 is more than 20 feet, not thirty, and certain equipment work requires protection regardless of height.

Section 1541.1 puts soil classification and the selection of a protective system on a competent person - defined as someone capable of identifying existing and predictable hazards AND authorised to take prompt corrective action, which is why the employer has to designate them. The other three are real participants who cannot carry the duty. The operator (a) may be the most experienced person on the crew and has no authority to stop the work. A registered professional engineer (b) enters where the excavation passes 20 feet or the system falls outside the appendices; below that the competent person may work from Appendix A. And a soils laboratory (d) can test a sample, while classification under Appendix A requires at least one visual and one manual analysis at the face, repeated as conditions change through the day.

8 CCR §1541 requires that for trench excavations 4 feet or more deep, a stairway, ladder, ramp, or other safe means of egress be located so workers travel no more than 25 feet laterally to reach it.

Government Code section 4216.2 requires an excavator to contact the regional notification centre - USA North 811 in the north, DigAlert in the south - at least two working days and not more than 14 calendar days before beginning the excavation, and section 1541(b) requires the estimated location of utility installations to be determined before digging starts. Option (d) keeps the call and loses the notice period, which is the whole point: the member operators need those days to come out and mark. Option (b) inverts the system - the one-call centre exists precisely so that an excavator does not have to identify and contact every operator, and a letter to one utility leaves the rest unmarked. Option (c) leans on record drawings, which are routinely wrong about depth and alignment; once marks are down, section 4216.4 still requires hand tools or vacuum excavation within the tolerance zone.

Section 5157(d)(5) requires the internal atmosphere to be tested with a calibrated direct-reading instrument BEFORE entry - oxygen first, then combustible gases and vapours, then toxic air contaminants - and the results are recorded on the permit. Testing comes first because it determines everything after it. Ventilating first (a) is the usual control once the atmosphere is known, and blind ventilation can make things worse, drawing in engine exhaust or sweeping a flammable mixture through its explosive range. An attendant and a retrieval line (c) are required for the entry and tell nobody whether the space is safe to enter. And a supplied-air respirator (d) presumes the answer: if the testing shows an atmosphere immediately dangerous to life, the entry does not proceed unless the space is made safe or entered under the rescue provisions.

Section 5157(i) gives the attendant a fixed post and a defined job: know the hazards, keep an accurate count of the authorised entrants, remain outside until relieved, communicate with the entrants, watch for prohibited conditions and for behavioural effects of exposure, order evacuation when something changes, and summon rescue. The attendant does not enter. Option (b) is the instinct that kills would-be rescuers - a large share of confined space fatalities are people who went in after a colleague - and an attendant may enter only where the employer runs a separate rescue programme with its own training, retrieval equipment and respiratory protection. Option (c) puts the attendant inside, where they can neither see the space as a whole nor reach the alarm. Option (d) takes them away from the opening, which is the one thing the standard forbids while anyone is inside.

Section 14300.7 makes a case recordable when it results in death, days away from work, restricted work or transfer to another job, medical treatment beyond first aid, loss of consciousness, or a significant injury diagnosed by a licensed health care professional. Section 14300.7(b)(5)(ii) then gives a closed list of what counts as FIRST AID, and cleaning a wound and applying a bandage or butterfly closure is on it, which is why (d) stays off the log. Options (a) and (b) are two of the recording criteria in plain words. Option (c) is the one candidates miss: a prescription medication counts as medical treatment at prescription strength whether or not the worker actually takes it, so the course of antibiotics makes the case recordable.

Section 14300.32 requires the annual summary to be posted in each establishment, in a conspicuous place where notices to employees are customarily posted, from February 1 to April 30 of the year FOLLOWING the year the records cover. It is a three-month window rather than a date, which is long enough that everyone - including employees on rotation, on leave, or working another site - has a real chance to see it. Each wrong answer bends one end of it: (a) starts before the summary has been reviewed and certified by a company executive; (b) starts before the year covered has even finished; and (d) leaves it up for eleven months, which harms nobody but shows the candidate has not learned the window.

California requires the employer to furnish the protective equipment the work demands and to bear the cost of it: Labor Code section 6401 obliges the employer to furnish safety devices and safeguards, section 6403(a) forbids allowing an employee to work in a place of employment not so furnished, and section 5144(c)(4) says it in terms for respirators. 'No cost' means no cost at any point, which disposes of (a) and (c) alike - a split and a payroll deduction both leave the worker paying. Option (d) inverts the rule: the duty runs to the exposed employee, and it is the worker on the wall rather than the manager in the trailer who needs the equipment. The narrow exceptions are about ordinary personal items the worker keeps, such as non-specialty prescription safety eyewear and everyday clothing and footwear.

Section 1513 puts housekeeping on the employer: during construction, alteration or repair, form and scrap lumber with protruding nails and all other debris must be kept reasonably cleared from work areas, passageways and stairs; storage areas and walkways must be kept free of dangerous depressions, obstructions and debris; and combustible debris must be removed promptly. The duty follows the employment relationship, which is what (b) and (d) miss - a general contractor's coordinating role and an owner's contract terms may add obligations and take none away. Option (c) is the everyday practice on site and is not the rule: a worker can be told to clean up after himself, and the employer still owes the condition of the passageway when a different trade leaves it blocked.

Section 3203(a)(3) requires a system for communicating with employees in a form readily understandable by all affected employees, INCLUDING provisions designed to encourage employees to inform the employer of hazards without fear of reprisal; and once a hazard is reported, (a)(6) requires correction in a timely manner based on its severity. Each wrong answer adds a filter the standard does not allow. A writing requirement (b) suppresses exactly the informal report the system exists to invite, and Labor Code section 6310(a)(1) protects an ORAL complaint to the employer as fully as a written one. Waiting for a competent person to confirm (d) reverses the order - the report is what starts the assessment. And handing the report to the general contractor (c) leaves the subcontractor's own duty undischarged.

Labor Code §6310 prohibits an employer from discharging or discriminating against an employee for filing a safety complaint or otherwise exercising rights under occupational safety laws. Such retaliation is unlawful.

Section 1637(b)(2) requires every scaffold to be designed and constructed with a dead load safety factor that supports, without failure, its own weight plus four times the maximum intended working load; 29 CFR 1926.451(a)(1) says the same. Six times (b) is the real figure from the same federal standard, but it applies to the SUSPENSION ROPES of a suspended scaffold under 1926.451(a)(4), not to the platform - a candidate who has read the standard is the one most likely to pick it. Two times (a) is a general construction rule of thumb and would leave a light-duty platform rated at 25 pounds per square foot with no margin for a stacked pallet of block. Ten times (d) belongs to no scaffold provision at all.

Section 1675(b) sends portable ladders used in construction to section 3276, and (e)(11) requires the side rails to extend not less than 36 inches - three feet - above the upper landing surface; where that extension is not possible, the ladder must be secured at its top and a grab device provided. The point of the extension is a handhold at the moment of stepping off, which is when most ladder falls happen. Six inches (c) gives nothing to hold. Ten feet (d) is a height from a different rule entirely. And (b) is the belief the rule exists to correct: a ladder ending flush with the landing leaves the climber nothing to hold while transferring their weight.

Section 3276(e)(9) states it as a fraction: the horizontal distance from the top support to the foot of the ladder is one-quarter of the working length - the length along the ladder between the foot and the top support. That is the 4-to-1 rule, and it works out at roughly 75 degrees. Half the working length (a) puts the base so far out that the foot slides once weight comes onto the lower rungs. The full working length (b) lays the ladder nearly flat. And a ladder set directly against the wall with no offset (d) tips backwards as soon as the climber leans out or steps off at the top.

Lockout and tagout exist to keep machinery from energising or starting up unexpectedly while someone is cleaning, repairing, servicing or adjusting it, and to release or restrain energy that is already stored - hydraulic pressure, a suspended load, a compressed spring, a charged capacitor. The wrong answers name real benefits of a locked machine that are not the purpose of the standard. Keeping unauthorised operators off (a) is security. Protecting the machine (b) is maintenance practice, and this standard protects the person rather than the equipment. And a damaged supply cord (c) is a shock hazard answered by before-use inspection and by GFCI protection, which are live-electrical controls rather than energy isolation.