Which specification should conductor sizes be selected from according to guidelines?

Selecting conductor sizes based on manufacturer’s specifications is essential because these specifications are developed based on rigorous testing and industry standards. Manufacturers provide detailed information about the electrical characteristics and thermal performance of their products, ensuring that the conductors are used within their intended parameters. Using these specifications allows for optimized performance, safety, and compliance with regulatory requirements.

Manufacturer's specifications generally take into account the specific materials, construction, and intended application of the conductors, which ensures that the appropriate size is selected for the expected load and environmental conditions. This helps in mitigating risks of overheating, electrical failure, or hazards due to inadequate sizing.

While standard industry guidelines and local electrical codes play important roles in the overall framework of electrical installations, they serve more as a baseline or framework rather than specific parameters tailored to individual products. Custom-designed requirements might be necessary in some scenarios, but typically, adhering to manufacturer specifications is the most reliable approach for selecting the correct conductor size.