Cable selection starts with the load
The connected load and protective device inform conductor sizing, but installation method, length and temperature must also be considered.
Account for the installation environment
Cables installed in conduit, trunking, trays, underground or in exposed locations may require different construction and ratings.
Check voltage drop and grouping
Long routes and grouped circuits can affect performance and allowable current. These calculations belong in the electrical design.
Send a cable schedule
A useful supplier enquiry lists cable type, conductor size, number of cores, approximate length or quantity and any required documentation.
Use this guide as general product-selection information. Confirm the final product against the project specification and current manufacturer documentation.