Safety Norms: Electronics, Semiconductor and Embedded Hardware Design

1Purpose, Scope, and Safety Principles

This document sets norms for people who design, build, test, program, repair and maintain electronic circuits, semiconductor test setups, printed circuit boards and embedded hardware systems. Norms marked MUST are mandatory for everyone in scope. Items marked SHOULD are recommended good practice. Where a local law, customer specification, site rule or manufacturer instruction is stricter, it prevails.

Requirements vary by jurisdiction. Verify current versions of any law, standard or code with the competent authority or a qualified professional before relying on a norm in this document.

• Treat every energized or unknown circuit as hazardous until it has been verified de-energized and tested.
• Design hazards out before relying on warnings, labels or personal protective equipment.
• No one works alone on mains-connected, high-energy or hazardous-process tasks.

2Roles, Competence, and Accountability

The laboratory or program owner MUST appoint a competent safety lead, maintain a current hazard register and provide resources for required controls. Project leads and engineering managers MUST ensure each task is risk assessed, that assigned staff are authorized for it, and that unsafe work stops immediately. Each designer and technician MUST follow these norms, report hazards and refuse tasks outside their training.

Competence means documented training, supervised practice and a named authorization. Authorization must be reviewed when tasks, equipment or hazards change.

• Work on mains-connected equipment MUST be done only by authorized persons, typically licensed electricians or trained staff where local rules permit.
• Soldering, rework and hot-air work require documented training and supervised practice before independent use.
• Laser, high-current, battery charging and chemical process tasks require a named authorizing person.
• Contractors and visitors MUST be inducted before entering active bench or test areas.

3Course-Specific Hazards and Risk Assessment

Common activities in this field include schematic capture, PCB layout, firmware development, bench bring-up, probing live boards, soldering and reflow assembly, die and wafer handling, environmental stress testing and field deployment. Each activity brings a different set of hazards, and risk assessment MUST be done for each task, not only for the room.

Risk assessment MUST use a recognized method, such as a likelihood and severity matrix. Record the hazard, who may be harmed, existing controls, residual risk and required actions. Rate risk as low, medium, high or critical. High and critical risks MUST NOT proceed until controls reduce them to an accepted level.

• Electric shock and arc flash: bench supplies, mains adapters, high-voltage test fixtures and power converters. Risk is high when probing energized boards with ungrounded instruments.
• Stored energy: electrolytic and high-voltage capacitors can hold lethal or damaging charge after power removal. Risk is high.
• Lithium battery hazards: thermal runaway, fire, venting and toxic gas during charging, testing or damage. Risk is high.
• Solder fume, flux and lead exposure: rosin fumes and leaded solder dust. Risk is medium to high depending on ventilation and volume.
• Chemical hazards: isopropyl alcohol, acetone, etchants, photoresists and cleaning solvents. Risk is medium to high.
• Electrostatic discharge: damages sensitive devices and can ignite flammable vapors in some process areas. Risk is medium for devices and high where flammable solvents are used.
• Laser and optical hazards: diode lasers used for debugging, marking or optical testing can injure eyes and skin. Risk is high.
• Heat and burns: hot-air rework stations, reflow ovens and soldering irons. Risk is medium.
• Ergonomic strain: microscope work, fine rework and long test sessions. Risk is low to medium.
• Radiation and strong magnetic fields: some inspection and characterization equipment. Risk depends on the device and requires access control.

4Preventive Controls and Safe Work Practices

Controls MUST follow the hierarchy of elimination, substitution, engineering controls, administrative controls and personal protective equipment, in that order. Design-stage controls are the most effective. Designers SHOULD specify isolation points, test points that are safe to probe, bleed paths for high-voltage capacitors, fusing, labeled voltage domains and current-limited power inputs before hardware reaches the bench.

Permits MUST be used for high-voltage work, live testing outside normal bench conditions, laser class upgrades, lithium cell high-current testing and any task the safety lead designates. A permit records the task, hazards, controls, authorized persons, isolation steps and end-of-task check.

• Isolate power, verify zero voltage with an instrument rated for the circuit, and confirm the instrument works before and after the test.
• Discharge capacitors through a designed bleed path. Never short a charged component directly with a screwdriver or leads.
• Set bench supplies to the lowest voltage and current needed, and never exceed component or board ratings.
• Use insulated tools and rated mats where the voltage involved requires them. Keep one hand clear of live parts where practicable.
• Do not bypass enclosures, interlocks or fuses to make a test run.
• Use a first-power procedure for new boards: current-limited supply, inspect for shorts, check rails one at a time and record observed values.
• Charge lithium cells only with chargers and profiles specified by the cell or pack manufacturer, in a fire-resistant location with smoke detection, and never leave prototype packs charging unattended.
• Store damaged or swollen cells in a designated container away from flammables and follow the disposal rules in section five.
• Solder and rework only with local exhaust extraction at the source. Wash hands after leaded soldering and do not eat or drink at the bench.
• Return soldering irons to stands and allow hot-air nozzles and reflow fixtures to cool before handling.
• Keep chemicals in labeled containers, consult the safety data sheet before use, and store flammables in approved cabinets.
• Wear grounded wrist straps and use conductive mats where sensitive devices are handled, and test strap continuity at an interval set by the ESD program owner.
• Use only the laser class and eye protection specified by the laser safety officer. Block beam paths and never direct beams at people or reflective surfaces.
• Before flashing firmware on a live system, confirm it is in a safe state and that actuators and motors are disconnected.

5Equipment, Environment, Information, and Protective Safeguards

Bench supplies, oscilloscopes, hot-air stations, reflow ovens, probers and test fixtures MUST be inspected before use, maintained according to manufacturer instructions and removed from service if damaged. Maintenance MUST be performed only by qualified persons, with the equipment isolated and tagged out. Verify current manufacturer and standards requirements for each device.

Environmental controls include local exhaust ventilation for soldering and chemical benches, temperature and humidity control for moisture-sensitive devices, and waste segregation. Dispose of lithium cells and batteries through approved recyclers. Do not place solder dross, etchant, photoresist waste or electronic waste in general trash or drains. Information held by the team also requires protection, as described below.

• Check fume extraction at an interval set by the safety lead and before each heavy soldering session using a simple airflow indicator.
• Keep extinguishers suitable for electrical fires at every bench, and provide a suitable extinguisher where reactive metals such as lithium metal are handled.
• Keep sprinkler heads, detectors, exits and electrical panels unobstructed.
• Design schematics, firmware, test data and unreleased layouts are confidential. Access MUST be role based and logged where the project requires it.
• Do not post unreleased design data to public repositories or personal storage.
• Store cryptographic keys and secure boot credentials in an approved vault, never in source files or shared drives.
• Test logs and device telemetry may contain personal data. Remove or anonymize it before sharing outside the authorized group.
• Change default passwords on embedded devices, disable debug ports in production where the design permits, and use firmware signing where specified.

6Incident Reporting, Emergency Response, and Escalation

Every incident, near miss and unsafe condition MUST be reported to the supervisor within the same shift and recorded in the local system. Near misses are early warnings and must be treated as seriously as injuries. Honest reporting MUST NOT lead to blame, although deliberate violation of mandatory norms may be handled under local policy.

In an emergency, protect life first, call emergency services and isolate energy sources only where it is safe. Do not touch a person who is still in contact with an energized source. Do not use water on a lithium battery fire unless the manufacturer or fire authority confirms it is appropriate. Evacuate and call emergency services instead.

• Electric shock: isolate the supply if safe, call emergency services, and provide cardiopulmonary resuscitation only if trained.
• Battery smoke or fire: sound the alarm, evacuate, keep clear of the cell and do not re-enter for property.
• Chemical spill: alert others, stop the source if safe, use a spill kit only if trained, consult the safety data sheet and call the designated response team.
• Laser exposure: stop the laser, record wavelength and power, and seek prompt medical assessment.
• Burns: follow local first aid training and seek medical attention for significant burns.
• Escalation: the supervisor informs the safety lead immediately for serious events. Notification to authorities is required in some jurisdictions, so verify the applicable reporting rules.

7Records, Training, Inspection, and Review

Records MUST include the hazard register, risk assessments, permits, equipment inspection and maintenance logs, calibration records, competence files, chemical inventories with current safety data sheets, battery logs and incident reports. Retention periods depend on jurisdiction and must be verified with the applicable authority.

Training MUST be completed before independent work and refreshed at an interval set by the local program. Core training includes induction, electrical safety, soldering and fume control, ESD, chemical handling, laser safety where relevant and emergency drills.

• Bench inspections against a checklist covering cords, supplies, extinguishers, labeling and housekeeping, at an interval set by the safety lead.
• ESD wrist strap, mat and grounding tests at a defined interval, with failures removed from use immediately.
• Review of norms with input from users after any incident, near miss or significant process change.
• Tracking of near-miss reports and closure of corrective actions, reviewed by management at a defined interval.

8Conclusion and Use of This Guidance

These norms are a starting point, not a substitute for approved local procedures, formal training, professional authorization, supervision or emergency services. Each team should adapt the hazard register, permit forms and emergency contacts to its own facilities and products, and should have the adapted version reviewed by a qualified safety professional.

Safe practice in this field depends on discipline at the bench. Treat unknown circuits as live, verify before you touch, and stop work when the controls do not match the task.

Implementation checklist

• Confirm a hazard register and task-specific risk assessment exist before starting work.
• Verify authorization and training before energized, lithium or laser work.
• Isolate, verify zero energy and discharge capacitors before handling internal conductors.
• Use current-limited supplies and follow the first-power procedure for new boards.
• Wear eye protection for lasers and use grounded wrist straps at ESD stations.
• Confirm fume extraction works before soldering or chemical work begins.
• Charge and store lithium cells under manufacturer specifications with smoke detection in place.
• Report every incident and near miss to the supervisor within the same shift.
• Protect confidential designs and remove personal data from shared logs and telemetry.
• Dispose of batteries, solder waste and chemicals only through approved channels.