Cable Tray Exit Opening Planner — Size a Cable Exit Envelope
Estimate a practical rectangular exit envelope from cable diameters and quantities, then compare it with your proposed tray or panel opening.
Opening assumptions
Cables exiting the tray
How the opening estimate works
The cable groups are sorted by diameter. The planner estimates how many cable envelopes can fit across the opening width and how many rows are needed. Side and top/bottom clearances are then reserved before comparison.
Why the result is an envelope, not a cut-out drawing
Cable exits can require more than a simple diameter calculation. Cable bend radius, tray accessories, support, mechanical protection, fire stopping and separation requirements may all change the physical opening.
Example
If an opening is 160 × 120 mm with 10 mm clearances, the usable envelope is 140 × 100 mm. The cable list is tested against that working rectangle.
Limitations
The result is a planning estimate intended to help review a proposed opening before detailing. It is not a fabrication dimension or installation approval.
Frequently asked questions
Can I mix cable diameters?
Yes. Each group can have its own diameter and quantity.
Does the tool calculate bend radius?
No. That needs cable-specific information and is outside this simple opening-envelope model.
Can I test an opening with zero clearance?
Yes, although that represents a geometric minimum rather than an installation allowance.