MOEL Ordinance No. 454: confined-space measurement, records and response (Partial amendment to the Rules on Occupational Safety and Health Standards)

Supply equipment as well as appointing a competent person

Article 619-2(1) already required a person with measurement/evaluation knowledge and practical experience to assess oxygen and hazardous gases before work. The amendment explicitly adds provision of measuring equipment.

Measurement itself is not a new duty introduced here. The existing pre-work requirement includes restarting after a temporary interruption, and earlier provisions address the measurer’s understanding and training.

Appointment without usable equipment is not an adequate operational arrangement.

Not a real site photo

1. Opening: Before entry, match the space and measurement points to the air-testing results.
2. Perimeter: Set the access boundary and coordinate entry procedures with the people responsible for testing and monitoring.
3. Outside area: review preparation space and verify measurement and attendance arrangements separately.

Training and equipment provision changed at different times

Article619-2 concerns measurement and evaluation of oxygen and harmful gases before work, including resumption after a temporary interruption. An earlier result does not establish the conditions at resumption. The provision includes renewed pre-work measurement even apart from whether ventilation or inflow conditions changed during the interruption.

Order417 in2024 addressed designation of a person with measurement and evaluation knowledge and practical experience, plus pre-work checks of understanding and necessary training. Topics include confined-space hazards, instrument condition and operation, measurement methods, and adequate-air criteria and evaluation. These were not first introduced by Order454 in2025.

Order454 expressly added provision of measuring equipment and retention of results. Designating a person and making the equipment available are connected requirements. A job title does not substitute for competence, and an instrument in storage does not show that pre-work measurement occurred.

Remote measurement remains part of pre-work evaluation

The reference to remote measurement using radio equipment or wireless communication dates to Order321 in2021. Order454 did not first introduce it. Remote operation can avoid sending a person inside, but it does not remove the need for representative measurement and evaluation. Match sensor configuration and installation to the hazards in the space.

If adequate air is not maintained, preventive measures include ventilation or provision and use of breathing apparatus or supplied-air respirators as required. The adequate-air tool only compares entered values with criteria; it is not an entry permit. Ventilation, attendance, communication and escape provisions must also be addressed.

The amendment also clarified a watcher’s response to abnormal conditions: promptly notify the local fire service, cooperate in appropriate action, and notify the employer and supervisor. Keep measurement-record duties and emergency-response duties traceable to the people and procedures that will actually perform them.

The attendant must not wait only for an internal response

Article 623(2) now specifies prompt notification to the competent fire service when a worker shows an abnormal condition, appropriate action with its cooperation, and immediate notification to the employer and supervisor afterwards. This clarifies the earlier general rescue-request wording and expands the internal recipients.

It does not instruct an unprotected attendant to enter for rescue. Separate rescue requirements, including respiratory protection in Article 643, must also be addressed.

Confirm understanding before work

Article 641 requires workers and attendants to be informed before work starts about confined-space hazards, work methods such as measurement and ventilation, protective equipment, emergency contacts and first aid, and the location and use of escape equipment. The amendment adds a duty for the employer to check understanding and provide necessary instruction.

After training, asking workers to point out and explain the contact details and the location of escape equipment themselves is a useful practical method. The wording defining the fire service in Article 562 was also adjusted to align with the related provisions.

A measurement record is not an automatic entry clearance; ventilation, attendance and emergency arrangements still matter.

Earlier results and results before resumption

If inspection stops and workers leave before resuming, the resumed start is within the provision’s measurement scope. A morning record should not bypass the later start. Time and location help connect each measurement to the relevant work and prevent confusion with another record.

Remote measurement also needs an identifiable location. Keeping the person outside and obtaining a representative reading are different issues. That is why measurement methods and understanding are separately addressed in training. Remote equipment does not remove that requirement.

Equipment provision is not a substitute for a record signature or competent operation. Instrument condition and operation are training topics. Related equipment articles explain sensors, units, functional tests and calibration; no device is described here as detecting every confined-space hazard.

Retain an identifiable measurement and evaluation record

New paragraph 4 requires the name of the person measuring/evaluating, date and time, location and results, retained for three years.

Records should make the assessment traceable rather than simply saying normal. The transitional provision applies to measurements under the article from 1 December 2025.

Adding instrument identity, sampling points and retest reasons is an practical suggestion.

Keep the person, time, place and result connected

Paragraph4 requires the measuring and evaluating person’s name, date and time, location and results to be recorded and retained for3 years. A photograph of numbers alone may not identify the person, time or place; an entry log with a name and time does not replace the measurement result. Connect the required items so the record identifies the relevant space and measurement.

The parenthetical provision includes fixed or mobile video-recording devices as an available method. It does not require every workplace to film every measurement. Whichever method is chosen must preserve the required information for the specified period. Video alone does not establish that the sampling location or evaluation was appropriate.

The supplementary provision applies the new record requirement to measurements made after commencement on2025-12-01. It does not require recreation of completed earlier measurements. Distinguish the periods while retaining any separately applicable, stricter workplace retention policy.

Connect records with attendance and rescue preparation

Measurement evaluates pre-work air conditions, while attendance and communication detect and respond to abnormalities during work. One record does not prove the other function occurred. A watcher needs to know the route to the fire service, employer and supervisor before work.

Article641 includes confined-space hazards, emergency contacts and the location and use of escape equipment. If locations or contacts change, compare the training information with what can actually be used. Do not record nonexistent equipment or training as an implementation of this provision.

Unprotected rescue entry into an oxygen-deficient space is not solved by improving paperwork. Entry and rescue need appropriate equipment, procedures and competence; a colleague should not simply follow another person inside. The practical confined-space article addresses the operational process.