All of our NODEs (except NODE Battery) use WAGO connectors for fitting wires to the modules.
Therefore, you just need to find an electricity cable, cut it and connect it to the WAGO so the electricity can run through the NODE. The WAGOs can fit cables sized up to 4mm² for the electricity.
For every NODEs functional input, the WAGO size differs based on purpose. The respective numbers for that can be found in the technical datasheet of each module.