1. Унутар опреме, везе између различитих компоненти морају да користе изоловане жице од бакра, које могу бити или стандардне жице или каблови. This wiring’s insulation needs to adhere to the equipment’s rated voltage criteria, а њен капацитет за тренутни проток и производњу топлоте мора бити усклађен са утврђеним стандардима, similar to the requirements for intrinsically safe electrical devices.
2. Wires within the equipment must be routed to avoid any contact with parts that are either high-temperature or mobile.
3. Internal wiring should be tidily arranged and securely bundled. Међутим, it’s imperative that суштински безбедан wiring is not bundled together with other types of wires. ‘Tidily arranged’ implies that each wire in the bundle should avoid crossing or tangling with others.
4. Стандардни, unshielded high-frequency wires should not be installed parallel to other wires.
5. Intermediate connections or joints are not permissible on internal wiring.