Does an electronic equipment protective case always need ESD protection?

Answer: Only when the load is static-sensitive. Mechanical parts suit plain foam; bare boards and ported units should be accepted on surface and grounding resistance.

How many decibels of shielding are enough?

Answer: Match the field to device sensitivity. Forty to fifty decibels covers most test work; above sixty, screw spacing matters more than coating.

Do wall penetrations break the ingress rating?

Answer: They do unless designed as a group. A flanged O-ring holds IP67 at thirty-eight decibels, and separating power from signal limits crosstalk.

Can case ground and equipment ground share a point?

Answer: They should. Stud, chassis and wrist strap on one bus bar give a single discharge path; two points still leave a potential on contact.

What matters when cases are stacked for storage?

Answer: The foam, not the shell. Under three-high stacking and eighty kilograms, low-density foam takes a set and the second trip has no cushioning left.

Electronic Equipment Protective Case: Scenarios and Options

Quick answer: An electronic equipment protective case covers field testing, base station spares, radar and antenna unit transfer, and bench moves between laboratories. The differences sit in ESD protection and grounding, shielding and wall penetrations, cushioning and fixing, and power and cable management.

Where an Electronic Equipment Protective Case Is Used
ESD Protection and Grounding Start With Surface Resistance
Shielding and Wall Penetrations: Seams and Holes
Cushioning and Fixing: Modules and Harnesses
Power Feed and Cable Management
FAQ

1. Where an Electronic Equipment Protective Case Is Used

Field testing is the noisiest duty: the case is loaded and unloaded two or three times a day, set on grass or gravel, opened while power and signal lines stay connected. What gets tested is the penetration seal and the cable anchoring.

Base station spares sit still: an electronic equipment protective case may hold parts for three to six months at minus twenty to fifty-five degrees Celsius and high humidity, and three-high stacking puts close to eighty kilograms on the bottom case.

Radar and antenna units travel short distances with the risk in static and impact: a metal housing rubbing an insulating insert builds charge that lands on a waveguide or coaxial pin.

Scenario	Dwell time	Priority	Typical failure
Field testing	One to three days	Penetration seals	Water at ports
Base spares	Three to six months	Stacking and dryness	Compressed foam
Radar units	Hours	Liner and port caps	Static damage
Bench moves	Half a day	Grounding	Poor ground

2. ESD Protection and Grounding Start With Surface Resistance

Surface resistance on an electronic equipment protective case is the first number, measured at one hundred volts. Conductive material sits between ten to the fourth and ten to the sixth ohm and drains charge almost instantly; dissipative material sits two to three decades higher, draining slowly enough to spare devices a violent discharge.

Grounding completes the path: M6 studs at four newton metres, case-to-earth under one ohm, a conductor of at least six square millimetres. A stud that bites only into coating looks grounded and measures tens of ohms.

Material	Surface resistance (Ω)	Drain path	Use
Conductive	10^4 to 10^6	Direct to earth	Modules, bare boards
Dissipative	10^6 to 10^9	Via one megohm	Units, harnesses
Insulating	Above 10^12	None	Outer structure

The usual gap sits between liner and operator: a wrist strap and a separately grounded case share no common point, so both belong on one bus bar.

3. Shielding and Wall Penetrations: Seams and Holes

Shielding effectiveness is quoted in decibels. At one gigahertz an electronic equipment protective case with coating and gasket reaches forty to sixty decibels, and beyond that the limit is seams and holes.

The lid edge is the longest seam. Screw spacing over fifty millimetres turns it into an antenna, and gasket compression belongs near thirty per cent, since tighter takes a permanent set and looser leaves contact resistance high.

Vent arrays under three millimetres per hole give about fifty-two decibels; a thirty-two millimetre cable flange drops to thirty-eight and needs an O-ring to recover the gap.

4. Cushioning and Fixing: Modules and Harnesses

Cushioning follows unit mass. Twenty-five millimetres of polyethylene foam under a four-point plate absorbs a thirty g, eleven millisecond half-sine shock, and four M4 screws with lock washers hold better than foam alone.

A bend radius under six times the cable diameter fatigues copper, and tie spacing beyond three hundred millimetres lets bundles swing into the pocket wall. An electronic equipment protective case wants separate channels tied to ribs rather than to foam.

5. Power Feed and Cable Management

Powered tests need one protected feed on the case: a 220 volt input through a thirty milliamp residual current device and a 65 watt DC module, with the device in an outside bay and never in a signal channel.

Penetration	Opening (mm)	Shielding (dB)	Ingress
Vent array	3	52	IP54
Circular flange	32	38	IP67
Interface plate	80 × 40	45	IP66

Cables on an electronic equipment protective case need strain relief. Loaded directly at the opening, the jacket is cut by the edge and the copper fails later; a clamp moves the load into the case body.

Conclusion

The four scenarios weight the requirements differently: sealing for field work, stacking for spares, static for transfer, grounding for bench moves. Writing those four as measurable numbers is what makes an electronic equipment protective case fit powered equipment.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.