The requirements placed on electrical systems in OEM industrial vehicles and equipment are fundamentally different from those that apply to standard commercial or passenger vehicle applications. Where a standard vehicle’s electrical system is designed for a defined temperature range, a predictable set of loads, and a maintenance schedule built around urban and highway operation, an industrial OEM electrical system may be expected to function continuously in ambient temperatures exceeding 50°C, in environments saturated with conductive dust, and under vibration loads that would destroy a standard automotive electrical system within months. Designing systems that meet these requirements, reliably, across the full service life of the equipment, is the core challenge of electrical engineering for OEMs in the resources sector.

What Electrical Engineering for OEMs Involves

Electrical engineering for OEMs involves the design, documentation, and production support of electrical systems that are integrated into a vehicle or equipment platform during its manufacturing process, rather than added to an existing vehicle as an aftermarket modification. The distinction is important because OEM integration requires the electrical system design to be developed in parallel with the vehicle’s mechanical and structural design, with interfaces defined at the earliest possible stage and the system architecture optimised for the specific platform rather than adapted to fit around it.

OEM electrical engineering programmes typically cover a range of system types including auxiliary power systems, control and monitoring systems, safety interlocks, communications and telematics interfaces, and specialised functional systems such as hydraulic controls, tyre inflation, or fluid dispensing. Each of these system types has its own design requirements, interface considerations, and certification obligations that must be managed as part of the overall programme.

Industrial electrical systems designed for OEM integration must meet a higher standard of environmental and mechanical robustness than aftermarket systems, because they are expected to perform without intervention across the full service interval schedule of the equipment, in operating conditions that are often more severe than those encountered by aftermarket fitout vehicles.

Industrial Electrical Systems for Extreme Environments

Thermal and Environmental Challenges

The thermal environment of an industrial mining vehicle is among the most demanding that an electrical system can be expected to operate in. Ambient temperatures in Australian mine environments regularly exceed 45°C during summer months. Engine compartment temperatures can reach 90°C or more in poorly ventilated locations. Surface temperatures on exhaust-adjacent components can approach 200°C during sustained operation.

These thermal conditions impose strict requirements on every electrical component in the system. Wire insulation must be rated for the maximum temperature it will encounter at each routing location, with margin to account for temperature rises caused by current flow and reduced heat dissipation under high ambient conditions. Connectors, terminal blocks, and control devices must be rated for continuous operation at the maximum temperature expected at their mounting locations. Electronic assemblies must be designed with thermal management provisions, heat sinks, ventilation, or active cooling, where necessary to maintain component junction temperatures within their rated limits.

Vibration testing to validate industrial electrical system designs for OEM programmes is carried out against relevant test standards such as IEC 60068-2-6 and IEC 60068-2-64, with test profiles that represent the actual vibration environment of the equipment’s operating conditions. This validation confirms that the system design will perform as intended across the equipment’s service life. EIG applies this validation discipline to every OEM electrical system it develops, ensuring that products are tested against the real environment, not a generic assumption.

Electromagnetic Compatibility in Industrial Vehicles

Electromagnetic compatibility (EMC) is a significant design challenge in complex industrial vehicle electrical systems. The combination of high-current switching loads, starter motors, hydraulic pump motors, solenoid valves, with sensitive electronic systems including telematics, proximity detection, and fleet management equipment creates an environment where electromagnetic interference is a constant risk.

EMC design measures in industrial electrical systems include physical separation of high-current power wiring from signal and communications wiring, use of shielded cables for sensitive signal circuits, filtering of power supply inputs to sensitive electronics, and careful management of earth architecture to prevent circulating currents from injecting noise into signal systems.

OEM vehicle integration programmes that include EMC consideration at the system design stage produce vehicles with significantly lower in-service EMC fault rates than those where EMC is treated as an afterthought. The cost of resolving an EMC problem after production has commenced is substantially higher than the cost of addressing it at the design stage.

OEM Vehicle Integration Process

System Requirements Definition

Every successful OEM electrical engineering programme begins with a thorough definition of the system requirements. This process captures not only the functional requirements of the system, what it must do, but also the interface requirements that define how it connects to the vehicle platform, the environmental requirements that define the conditions it must operate in, and the regulatory and certification requirements that define the standards it must meet.

Interface control documents are a critical output of the requirements definition phase. These documents define every interface between the new electrical system and the existing vehicle systems, mechanical mounting points, electrical connection points, software interfaces, and communication protocols, with sufficient precision to allow independent design teams to develop compatible subsystems. The quality of interface control documentation is a direct predictor of integration quality: systems developed against poorly defined interfaces frequently require significant rework when they are brought together for the first time.

Design and Prototyping

The design phase of an OEM electrical engineering programme produces the complete set of engineering documentation required to manufacture a prototype system: circuit schematics, harness drawings, bill of materials, component specifications, and assembly instructions. This documentation is developed iteratively, with design reviews at defined milestones to verify that the design meets the requirements and identify any issues before they are embodied in hardware.

Prototype systems are built from the released design documentation and subjected to functional and environmental testing to validate performance against the requirements. Testing findings inform design refinements, which are captured in updated documentation before the design is released to production. For OEM clients who require integrated electrical engineering and physical installation capability, the electrical engineering solutions service at EIG covers the full design-through-prototype cycle under a single point of responsibility.

Production Documentation and Release

The transition from prototype to production requires that all design documentation is formally released, controlled under a document management system, and structured to support ongoing manufacturing, supply chain management, and product support activities. Drawing control ensures that manufacturing always works from the current approved design, and change management processes ensure that modifications are assessed for impact, approved, and implemented in a controlled manner.

Production documentation includes the released revision of all engineering drawings, the approved bill of materials with qualified supplier information, assembly and installation instructions, and the first-article inspection record. This documentation set supports the full lifecycle of the product, from initial production through field service and eventual end-of-life replacement.

On-Site Commissioning Support for OEM Programmes

On-site commissioning support is an important element of OEM programme delivery for industrial equipment. When a new electrical system is integrated into a vehicle platform for the first time in its intended operating environment, commissioning activities verify that the system performs as designed under actual operating conditions, that interfaces with other vehicle systems function correctly, and that operators understand the system’s operation and maintenance requirements.

Commissioning for OEM programmes may take place at the manufacturer’s facility, at a staging area, or at the customer’s operating site. In each environment, the commissioning team must have the documentation, test equipment, and technical knowledge to carry out a thorough integration test and resolve any issues that arise before the equipment enters service. The on-site installation support capability at EIG provides the logistical and technical capacity needed to carry out commissioning activities at remote locations across Australia.

Workshop Installation Services for OEM Fitout Programmes

For OEM vehicle production programmes where multiple vehicles need to be built to a consistent standard, workshop-based installation provides the controlled environment and consistent process discipline needed to achieve uniform output quality at scale. A workshop installation environment provides access to hoists and positioning equipment, calibrated torque tools, electrical test equipment, and the physical space needed to work efficiently on multiple vehicles simultaneously or in sequence.

Engineered Installations Group‘s Perth facility supports OEM fitout programmes with workshop installation services that are structured to meet the quality and throughput requirements of series production. The team’s experience with fleet fitout programmes across the mining and resources sector provides the process knowledge and quality management capability needed to deliver consistent results across programmes of varying scale.

Industrial Electrical System Reliability Over the Asset Life

OEM electrical system design decisions made during the development phase have a direct bearing on the system’s reliability and total cost of ownership across the asset’s service life. Design decisions that optimise for lowest initial cost, by using minimum-rated components, omitting redundancy, and providing minimal documentation, typically produce the highest long-term cost through increased maintenance frequency, longer diagnostic times, and greater downtime.

Reliability-centred design for industrial electrical systems involves the systematic identification of failure modes and their consequences, followed by design choices that reduce the probability or severity of the most significant failures. This approach does not necessarily require higher-cost components, in many cases, the most effective reliability improvements come from better documentation, more accessible connection points, and standardised component selection rather than from component upgrades.

EIG’s Electrical Engineering OEM Capability

Engineered Installations Group brings the full scope of electrical engineering OEM capability to industrial vehicle and equipment programmes, from system requirements definition through design, prototyping, production documentation, and ongoing support. The team’s experience across mining, transport, and heavy vehicle platforms means that the design decisions made at the programme outset are informed by knowledge of how these systems actually perform in service, not just how they are expected to perform on paper.

The combination of engineering design capability, manufacturing capacity, and field installation experience makes EIG a practical partner for OEM clients who need a single point of technical responsibility across the full programme lifecycle.

Conclusion

Electrical engineering for OEMs in the industrial and mining sectors demands a level of technical rigour, environmental awareness, and documentation discipline that goes well beyond standard automotive electrical engineering practice. Systems that are designed to meet the genuine requirements of their operating environments, integrated with precision into their vehicle platforms, and supported by complete, accurate documentation will deliver reliable service across the asset’s service life. Those that are not will generate a maintenance burden that compounds year after year. To discuss electrical engineering OEM services for your next programme, call +61 (08) 9419 7318 to speak with the EIG team.