Construction Regulation 21: Explosive Actuated Fastening Devices

Explosive Actuated Fastening Devices – Power Tools with Precision and Risk

In construction, speed and strength often go hand in hand—and nothing embodies that quite like an explosive actuated fastening device. These powerful tools drive nails or studs into hard surfaces like concrete or steel using a controlled explosive force. They’re incredibly efficient but also carry significant risks if used incorrectly.

That’s why Construction Regulation 21 under the Occupational Health and Safety Act (Act 85 of 1993) lays down strict rules for their use. This regulation isn't about slowing down progress—it's about ensuring that the people behind the tools are protected, competent, and compliant.

.Construction Regulation 21

 

What is an Explosive Actuated Fastening Device (EAFD)?

An Explosive Actuated Fastening Device, sometimes called a powder-actuated tool (PAT), is used to fasten steel plates, brackets, timber, or sheeting to concrete, masonry, or structural steel. It operates using a cartridge charge, similar to a firearm, that creates explosive pressure to drive a fastener into a surface.

Because of the force involved, EAFDs pose dangers similar to firearms, which makes their regulation not only necessary but life-saving.

Personal Protective Equipment (Construction Regulation 21(1)(a))

The first line of defence when using EAFDs is suitable personal protective equipment (PPE). The user must be provided with and must wear:

  • Eye protection (safety goggles or face shields)
  • Hearing protection (earplugs or earmuffs)
  • Protective gloves
  • A hard hat in operational environments

Failure to wear the correct PPE can lead to serious injuries from flying debris, noise exposure, or accidental discharge.

Training and Competency (Construction Regulation 21(1)(b))

Only individuals trained in the safe operation, maintenance, and handling of EAFDs may use them. This training should include:

  • Understanding the risks of misfire, ricochet, or over-penetration
  • Familiarity with different cartridge types and suitable applications
  • Hands-on training under supervision

No one should operate an EAFD without verified competence. This isn't just best practice, it’s a legal requirement.

Built-in Safety Mechanisms (Construction Regulation 21(1)(c–d))

To prevent accidents during use, the EAFD must have:

  • A protective guard around the muzzle, which contains flying fragments or particles.
  • A firing mechanism that prevents discharge unless:
    • The tool is pressed firmly against the surface with at least twice its weight.
    • The barrel is aligned within 15 degrees of a right angle to the work surface.

These features are designed to prevent unintentional discharges and control the direction of fastener travel.

Correct Cartridges for the Job (Construction Regulation 21(2)(a))

Each EAFD requires specific cartridges based on:

  • The material being fastened
  • The substrate (e.g., steel vs. concrete)
  • The strength and depth of penetration required

Using incorrect or improvised cartridges is extremely dangerous. The law requires cartridges to be matched to the tool and task.

Daily Inspections by a Competent Person (Construction Regulation 21(2)(b–c))

Before each use, a competent person—appointed in writing—must:

  • Inspect and clean the EAFD
  • Ensure all safety devices are functioning correctly

This prevents mechanical failures, misfires, and wear-related accidents. It’s also vital for ensuring the long-term integrity of the device.

Secure Storage (Construction Regulation 21(2)(d–e))

When not in use:

  • The EAFD and its cartridges must be locked away in a safe, secured area that’s inaccessible to unauthorized personnel.
  • Tools must never be stored loaded, even temporarily.
  • Warning signage must be posted clearly and visibly wherever EAFDs are in operation to alert bystanders and non-users.

This protects the workforce from unintended exposure or access to these high-risk tools.

Strict Control of Cartridges and Fasteners (Construction Regulation 21(2)(g))

All cartridges, nails, or studs used with EAFDs must be:

  • Issued and collected in writing by a person appointed in writing for that specific task.
  • Recorded in a register, and the recipient must:
    • Sign for all items issued
    • Return and sign off all spent and unspent cartridges

This traceability ensures accountability and prevents unauthorised or untracked usage.

The explosive actuated fastening device is an incredible asset in construction, if it’s used correctly. Construction Regulation 21 reinforces the message: This is not a regular power tool. It must be treated with the same seriousness and care as a firearm.

By following the regulation:

  • Workers are protected.
  • Accidents are prevented.
  • Projects remain compliant and professional.

Every fired nail is a reminder, power must always be guided by safety.

ZSC helps you integrate safety into your project design, ensuring that all regulatory requirements are met, and your project proceeds without safety concerns. Contact us to learn how we can make your project safer and compliant from start to finish on 021 010 0209 or This email address is being protected from spambots. You need JavaScript enabled to view it.
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