For defined gas and vapour hazardous-area electrical work
Hazardous Area Electrical Installations in Scotland
CompEx-supported installation, additions and alterations for identified gas and vapour hazardous areas. WB Electrical works from the issued classification and project information to install suitable electrical systems with controlled access, clear interfaces and traceable handover.
Based in Larkhall, we support suitable industrial and process projects across Scotland. Current marketed hazardous-area competence is gas and vapour, with each task reviewed before acceptance.
Defined scope. Suitable Ex equipment. Traceable handover.
New work, alterations and controlled replacement
When hazardous-area installation support is the right route
When the electrical task sits inside, or directly interfaces with, an already identified gas or vapour hazardous area. WB’s present marketed hazardous-area installation scope is gas and vapour.
A new circuit or item of equipment
A project needs new electrical supplies, containment, lighting, controls or other equipment within an identified Zone 1 or Zone 2 gas or vapour location.
An existing Ex installation is changing
Process equipment, machinery or site infrastructure is being altered and the connected electrical installation needs a controlled modification rather than an ordinary commercial alteration.
Equipment is being replaced or upgraded
Existing Ex equipment has reached end of life, no longer suits the project need, or an inspection or engineering review has identified a defined replacement scope.
Defined electrical scope and clear interfaces
What WB can install and alter in gas and vapour hazardous areas
The exact electrical scope depends on the classification, substance information, equipment duty and issued design. Typical work can include the following where the project information is suitable and the task fits the available competence.
Circuits, containment and cable routes
New or altered circuits, cable routes, tray, ladder, conduit and associated electrical infrastructure planned for access, inspection and future maintenance.
Ex equipment and connections
Installation or replacement of appropriately selected enclosures, isolators, junction boxes, glands, entries, seals and terminations for the defined location.
Lighting, power and control interfaces
Electrical supplies and connections for suitable lighting, power, motors, instruments and control interfaces where the project responsibilities and equipment information are clear.
Inspection and testing applicable to the completed electrical work, plus agreed equipment, circuit and close-out records, can form part of the installation handover. Formal hazardous-area classification and the employer’s wider DSEAR risk assessment remain separate responsibilities.
Information, equipment, permits and working windows
Plan the installation around the classified location and the operation
Hazardous-area electrical work must fit the technical requirements and the way the site is controlled. Early review of the available information helps identify missing inputs before labour, equipment and shutdown arrangements are committed.
01
Review the issued site information and electrical scope
Confirm the work location, current hazardous-area drawing or classification, relevant gas or vapour information, equipment records, proposed Ex equipment and the electrical outcome the project needs.
02
Agree permits, access and isolation
Coordinate with the site team around permits, authorised contacts, gas testing where applicable, safe isolation, access equipment, production activity and any shutdown window.
03
Install, inspect and hand back
Complete the agreed installation or alteration, carry out the checks included in the scope, identify exclusions or separate findings and issue the applicable close-out information.
A zone label is only part of the input. Equipment and installation requirements also depend on the actual gas or vapour hazard, temperature requirements, protection concept, certification information and manufacturer instructions for the intended use.
Need to coordinate the work with a live process, permit system or shutdown? Discuss your hazardous-area installation with WB.
Useful records, not a broad compliance label
A handover that supports the next inspection and maintenance task
Close-out for the completed electrical scope
- Electrical inspection and test records applicable to the work completed.
- Equipment, circuit or asset references included in the agreed handover.
- Labels, as-installed notes or drawing mark-ups where they form part of the project scope.
- Clear identification of exclusions, outstanding issues or separate follow-on work.
Agree the handover format before work begins, especially where the client maintains an Ex register, asset schedule or project-specific close-out pack.
What the installation handover does not replace
The close-out for one electrical project does not replace the employer’s DSEAR arrangements, a formal hazardous-area classification, an ongoing Ex inspection programme or the wider site Ex file.
If the requirement is primarily about the condition of existing equipment, use Hazardous Area Inspection and Testing. For continuing support, see Planned and Reactive Hazardous Area Maintenance.
The handover should make the completed electrical scope, exclusions and any separate follow-on requirements clear enough for the next inspection, maintenance or project task.
Project evidence from a working distillery
Experience of electrical work around controlled industrial operations
North British Distillery
WB Electrical has supported North British Distillery since 2016 across planned upgrades, reactive fault finding, testing and infrastructure work at the Edinburgh distillery and associated warehousing sites.
Where a task interfaces with an identified gas or vapour hazardous area, the work is planned against the client’s current hazardous-area information, equipment requirements, permits and controls. Specialist installation still has to fit real production, access and shutdown constraints.
Competence and supplier assurance
CompEx validates individual competence for defined hazardous-area work; it is not a blanket company or site compliance certificate. WB allocates engineers to the accepted task and can provide relevant competence and accreditation evidence during supplier review or quotation.
Scope, competence and project information
Hazardous area installation questions
Are WB Electrical engineers CompEx certified for hazardous-area installations?
WB’s present marketed gas and vapour service uses engineers holding relevant CompEx Ex01-Ex04 competence. The exact personnel, current certificates, task and supervision requirements should still be checked against the accepted work before mobilisation.
Can WB install or alter electrical systems in Zone 1 and Zone 2 areas?
Yes, defined electrical installation and alteration work can be considered in identified gas and vapour Zone 1 and Zone 2 locations. The classification, equipment, substance information, project responsibilities and site controls must be reviewed for the actual task before quotation and acceptance.
Does WB carry out the DSEAR risk assessment or decide the hazardous-area classification?
Not as part of the standard installation scope. The employer or appointed competent specialist should provide or confirm the relevant DSEAR information and hazardous-area classification. WB then uses that information to plan and deliver the agreed electrical work.
Can you install equipment described as ATEX or explosion proof?
We review the actual Ex marking, certification information, intended location, protection concept and installation requirements rather than relying on a broad product description. The equipment and accessories have to be suitable for the confirmed project conditions and installed in accordance with the applicable information.
Do you currently undertake combustible-dust hazardous-area installations?
Not as part of the present marketed scope. WB’s current offer is gas and vapour hazardous-area work. Dust-specific work should only be added to the service after the relevant training, certification and delivery arrangements have been completed and verified.
Use the route closest to the immediate need
Related CompEx and hazardous-area services
Existing Ex equipment needs inspection?
Visual, close or detailed Ex inspection support for existing gas and vapour equipment, with asset-referenced findings and defined reporting.
Need ongoing hazardous-area maintenance?
Ongoing Ex maintenance, fault investigation and controlled remedial support where the client, response route, permits and isolations are agreed.
Installing or replacing specific Ex equipment?
A focused route for installing or replacing appropriately selected Ex enclosures, isolators, junction boxes, glands, lighting and connected equipment.
For the wider service family, return to CompEx & Hazardous Area Electrical Services. Documentation-led requirements can use Documentation and Compliance Reporting.
A useful first enquiry
Request a hazardous-area installation quotation
Tell us what is changing, where the work sits and which hazardous-area information is already available. We will review whether the task fits WB’s present gas and vapour competence and identify what needs clarifying before pricing.
Information that helps us quote
- Site, building and exact work location.
- Current zone drawing or hazardous-area classification, if available.
- Gas or vapour involved, equipment references and relevant project information already issued.
- Required installation outcome, project programme and any shutdown window.
- Permit, access, isolation and handover requirements.
Mention available drawings, zone information, Ex register entries or inspection findings in the enquiry. The office will confirm how to share them.
What affects a hazardous-area installation quotation?
Equipment type and certification information, cable routes, access, permits, isolation arrangements, shutdown windows, phasing and the required inspection or handover records all affect the quotation.
Where the hazardous-area information is incomplete or the installation interfaces are complex, a site survey or technical review may be needed before a firm scope can be priced.
If the main requirement is hazardous-area documentation or record close-out, use the Documentation and Compliance Reporting route.