Spain · National · Order

Order TEC/1146/2018: toxic and flammable gases in underground activities

In force within the stated scope

Current official Spanish title: Orden TEC/1146/2018, de 22 de octubre, por la que se aprueba la instrucción técnica complementaria 04.7.06 "Control de gases tóxicos en la atmósfera de las actividades subterráneas" y se modifica la instrucción técnica complementaria 05.0.02 "Especificaciones para minas subterráneas de carbón y labores con riesgo de explosión. Contenidos límites de metano en la corriente de aire", del Reglamento General de Normas Básicas de Seguridad Minera.

On this page
  1. What it regulates
  2. Who it applies to
  3. Key provisions
  4. History and versions
  5. Transitional provisions and application notes
  6. Official BOE legal relationships
  7. Official sources
  8. Explore the concepts in Sabentis Explore

What it regulates

Approves ITC 04.7.06 on assessing and controlling toxic gases in underground activities and extends ITC 05.0.02 to other flammable or explosive gases.

Who it applies to

ITC 04.7.06 addresses CO, CO₂, NO, NO₂, hydrogen sulphide and SO₂, and control of exhaust fumes and gases; other agents and explosive atmospheres require their specific rules.

Key provisions

The safety and health document must record initial assessment, measurement methods and frequency, ventilation control, maintenance and records. Gas mixtures and changes in work must be considered.

Complementary Technical Instruction 04.7.06

Initial, periodic and control measurements are distinguished, together with daily and short-term limits. Measurements do not replace technical and organisational risk reduction; the ITC also requires oxygen not to fall below 19% by volume.

Complementary Technical Instruction 04.7.06

Exceeding limits requires investigation and corrective action. In control measurements, reaching or exceeding the short-term limit requires stopping the task and withdrawing staff to the designated areas. The specific rules for each measurement type must be applied.

Complementary Technical Instruction 04.7.06

The instruction includes maintenance of gas-generating equipment, health surveillance and training and information on risks, measures and relevant results.

Complementary Technical Instruction 04.7.06

The amendment to ITC 05.0.02 sets a maximum hydrogen concentration of 0.4% by volume and requires measures to prevent other explosive gases from reaching their explosive range. Occupational exposure limits are not fire-alarm thresholds.

Article 2

History and versions

Initial publication: 30/10/2018 · Initial entry into force: 30/04/2019

BOE-A-2018-14894

Order published on 30 October 2018, with deferred entry on 30 April 2019. It approves ITC 04.7.06, amends 05.0.02 and repeals only the stated section of 04.7.02. The checked record lists no later changes to this instrument.

All text versions recorded by the BOE

Publication and effective dates are different. The table retains the dates and provisions of each recorded text version; it does not treat future transitional deadlines as requirements already applicable.

Transitional provisions and application notes

  • Published on 30 October 2018, it entered into force on 30 April 2019 after six months. This start date must not be confused with publication.

    Final provision third
  • Express repeal affects section 1 of ITC 04.7.02 on gas concentration limits, not the whole ITC. Read the sector-specific regime alongside applicable chemical-agent and carcinogen rules.

    Repealing provision sole
  • BOE also published this content as Order TEC/1196/2018, BOE-A-2018-15685. It is recorded as a linked duplicate publication, not as an independent obligation or a new amendment.

    Official reference

Official BOE legal relationships

Relationships may affect only specific provisions. They do not by themselves determine the status of the whole instrument: consult its history and application notes.

Earlier references (3)

Official sources

Official sources checked on 14/11/2026. Updating a database record does not by itself mean that the legislation has been amended.

  1. BOE-A-2018-14894
  2. BOE-A-2018-14894
  3. ELI identifier
  4. BOE-A-2018-15685

Official sources checked on 14 November 2026. Consolidation, where available, is informative and has no legal force. Consult the official publication and check the applicable provision and date.

Sabentis editorial translation into English; it is not an official translation and does not replace the official text.

Editorial information

Publication date: 14 November 2026.

Editorial responsibility: Sabentis editorial team.

Editorial review by Pablo RodríguezLinkedIn

Executive Vice President of the International ORP Foundation and Chief Financial Officer of Sabentis.

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