The purpose of the box
A terminal block box groups and protects connection points while keeping them accessible for installation and service. The box and terminal arrangement should be treated as one assembly.
Define capacity and access
Confirm the number and size of conductors, entry direction, working space and how the cover will be opened during installation or maintenance.
Selection checklist
State the actual installation conditions instead of choosing only by outside dimensions.
Terminal quantity and conductor range
Cable entry direction and gland needs
Mounting location and available space
Required enclosure material and protection
Labeling, accessories and documents
Check the complete installation
Cable bending space, conductor identification and tool access can be as important as the nominal number of terminals. Review these details before approving the enclosure.