How to Plan Cable Entries in Die Cast Aluminum Enclosures

Record the cable’s outside diameter, jacket material, cross-sectional shape, and whether it arrives with a connector already attached. Also identify whether the cable will remain fixed after installation or be disconnected during maintenance.

Then describe the operating environment. An indoor control device, an outdoor sensor, and equipment exposed to cleaning fluids may need different entry arrangements. Tell the hardware supplier about expected temperature conditions, liquids, cable movement, and cleaning methods.

Specify the required protection using the applicable standard and test conditions. IEC 60529 defines the IP classification system for enclosure protection, but a code alone does not describe every environmental or chemical exposure.

Review the available die cast aluminum enclosures alongside the cable-entry requirements. Leave enough freedom to change the enclosure size if the selected hardware needs more installation space.

2. Cable Gland vs. Panel Connector: Which Entry Does Your Design Need?

These arrangements address different assembly and service needs.
A cable gland allows a cable to pass through the enclosure wall and uses a specified sealing arrangement around its jacket. Selection depends on the actual cable diameter and the gland manufacturer’s instructions. Check the published clamping range rather than selecting by thread size alone.

A panel connector provides an interface at the enclosure wall. Review its specified cutout, panel-thickness range, fixing method, sealing components, and mating connector.

Ask which conditions apply to the connector’s protection rating. Some products specify performance only when properly mated or fitted with a particular protective cap. The unmated service condition should therefore be considered during selection.

For a cable supplied with a large molded plug, check the assembly sequence before choosing a conventional gland. The plug may prevent the cable from being passed through the selected opening. Ask the hardware supplier about suitable installation options instead of enlarging the hole without reviewing the seal.

3. How Do You Determine the Correct Cable Gland Hole Size?

Use the selected hardware manufacturer’s mounting drawing to specify the opening. Do not calculate the hole from cable diameter: the cable passes through the gland, while the enclosure opening accommodates the gland’s mounting feature.

For example, if a selected gland clamps a 6 mm cable and uses an M16 mounting thread, the enclosure opening is not a 6 mm hole. Confirm the exact thread designation and the manufacturer’s specified clearance opening or tapped-hole requirements. These example values illustrate the distinction; they are not a universal sizing recommendation.

For a gland, identify the mounting-hole requirement or specified enclosure thread. A threaded installation and a clearance hole with a locknut are different constructions; the drawing should state which one is intended.

For a panel connector, include the cutout shape, mounting pattern, orientation, and any required anti-rotation features. Mark which face is outside the enclosure so an asymmetric opening cannot be interpreted in reverse.

Identify whether dimensions refer to the machined part or the finished surface. Ask the enclosure manufacturer to review any coating or finishing steps that affect the hardware’s fit.

Keep the hardware part number with the drawing package. If procurement later substitutes another gland or connector, compare its mounting and sealing requirements before accepting it as interchangeable.


4. Check Cable Gland Panel Thickness and Thread Engagement

A cable-entry device needs a compatible mounting surface.
Review the local wall thickness at the proposed opening rather than assuming that the enclosure has the same thickness everywhere. Include ribs, bosses, recesses, and the internal wall shape in the review.

For a locknut installation, check that the threaded section reaches through the wall and engages the nut as required by the hardware instructions. For an entry threaded directly into the enclosure, have the manufacturer review the thread specification and available material.

Show where the sealing washer or O-ring will contact the enclosure. Ask whether that area provides the surface and geometry required by the selected device.

If the hardware needs a prepared mounting pad, request a machining review before committing to the position. Avoid adding such a feature to a drawing without checking its relationship to the surrounding enclosure structure.

5. Check Locknut Clearance and Assembly Tool Access
A component that fits geometrically may still be difficult to install.

Place the gland body, locknut, cable, and nearby components in the assembly model. Then review how each part will be held and tightened. Consider access from both sides of the wall.

Spacing should account for the tools used during assembly and service. Closely grouped entries can make it difficult to hold one fitting while tightening another. Internal ribs or a nearby PCB may also obstruct the locknut.

Ask the assembly team to review the proposed layout before machining the prototype. Their working sequence may reveal a problem that a finished assembly view does not show.

Avoid solving a tool-access problem by assuming that the installer can leave a fitting partly tightened. Use the hardware manufacturer’s installation requirements as the basis for the layout.

6. How Much PCB Clearance Does a Cable Gland Need?
There is no single PCB clearance that works for every cable gland. Build the required space from the gland’s internal projection, locknut, tool envelope, cable bend requirement, and termination position. The entry location should support the complete cable route.

Inside the enclosure, check the path from the entry to the terminal or circuit board. Include the cable manufacturer’s bend requirements and leave access for the intended termination method.

Keep the route clear of lid fasteners, mounting hardware, and other features that could interfere with assembly. If the lid will be removed during service, show how it can move without pulling on the internal wiring.

Outside the enclosure, review the installed cable direction and available space. Include the mounting surface, adjacent equipment, and the mating connector where relevant.

Consider how the cable will be supported in the final installation. Ask the responsible designer to define the expected cable loads and the required retention arrangement. A cable layout that works on a desktop may behave differently when installed vertically or connected to heavier field wiring.

7. Does Drilling an Enclosure Affect Its IP Rating?
Drilling adds a new interface to the enclosure’s protective boundary. Do not assume that an unmodified enclosure’s IP rating automatically applies after adding cable entries. Review the completed configuration and its validation requirements with the responsible supplier or test laboratory.

Identify the enclosure’s gasket path before placing holes.
Show the intended entry locations relative to the lid joint, gasket contact area, and fastening features. Ask the enclosure supplier to review the proposed changes before approving them.

Mounting holes also deserve attention. Some enclosure designs keep mounting features outside the gasket perimeter; others use different arrangements. Confirm the construction of the selected model rather than assuming that every mounting point is isolated from the protected interior.

Treat unused openings as part of the final design. Specify suitable blanking hardware and its installation requirements where spare entries are needed.

A rated gland installed in a rated enclosure does not, by itself, establish the performance of the completed equipment. Request a review and appropriate validation of the modified configuration, including the actual cable, hardware, seals, and installation method.

8. Does Your Sealed Electronics Enclosure Need a Vent?
Review pressure changes and condensation separately from cable sealing. Purpose-designed protective vents can help equalize pressure and reduce retained condensation, depending on their selection and installation. A cable gland should not be assumed to provide this function.

If a vent is needed, ask its supplier to review the enclosure volume, operating environment, mounting position, and required protection before adding the opening.

9. Test Cable Entries with the PCB and Wiring Installed
Inspect the prototype with production-intent hardware and the actual cable.

Check that entry components seat correctly, installation tools can reach them, and cables can be routed and terminated without interference. Review lid removal and reassembly as well as the initial build.

Use the hardware manufacturer’s tightening instructions. Record the selected parts and assembly procedure so later samples can be compared consistently.

For equipment with an ingress-protection requirement, arrange the applicable testing on a representative completed configuration. Record the tested design revision and review subsequent changes before assuming that earlier results still apply.

A substitute cable, connector, seal, or blanking plug should trigger an assessment of the affected requirements.

Cable Gland and Connector Cutout Checklist

Custom Machining for Die Cast Aluminum Enclosures

Evernice supplies electronic enclosures and offers CNC machining services for custom enclosure projects. Browse our die cast aluminum enclosure range, then share your proposed cable-entry layout and hardware drawings for review.
For opening and machining requirements, see our custom enclosure machining service. You can also contact Evernice with the enclosure reference, cable details, quantities, and application requirements.