A case's cable grommets are sized around whatever the original manufacturer assumed you would be routing through them - typically the factory cables that shipped with a standard power supply. Six 16AWG sleeves, thicker than a stock lead and arriving with connector junctions attached, ask considerably more of those same openings than the designer ever planned for.

Quick Answer

Thicker 16AWG leads and six of them together can make a tight grommet the limiting factor in the whole job. Feed one cable at a time. Working out which opening each run uses before you start avoids discovering halfway that three leads will not share one cutout.

🕳️ Why grommets become the bottleneck

Case grommets are sized around the factory cables the case designer expected to pass through them - generally thinner, junction-free leads straight from a stock power supply. Six thicker 16AWG extensions, each carrying a connector junction at the point where it meets the original factory lead, ask considerably more of that same opening than the design ever accounted for, which is exactly why a grommet that felt generous with stock cabling can suddenly feel cramped once a full six-piece kit is being routed through it.

🔀 Whether the junction itself should pass through

Ideally, the connector junction should pass through the grommet along with the cable, leaving only sleeved cable visible on the front side of the tray. On a genuinely tight opening, though, the connector housing may be the specific part that refuses to fit through cleanly - which changes where that junction can realistically sit, potentially forcing it to remain on the visible side of an opening it cannot pass through.

🧯 Avoiding damage while feeding cable through

Feed each lead through gently, one at a time, and never drag a connector housing through a grommet under any real tension - that is precisely how a rubber grommet lip tears over repeated use. Where an opening is proving genuinely too tight regardless of care taken, temporarily removing the rubber insert entirely and refitting it once the cable is through is a far better approach than forcing the connector through while it is still seated.

🔢 How many leads can share one opening

Two leads can often share a single grommet opening without much drama, but three thicker leads crowded through one cutout tends to visibly bulge the rubber and leave the cables crossing awkwardly right at the point where they emerge on the other side. Where an opening is simply too small for what you are trying to route through it, sending that particular lead through the next opening along the tray is the better call - a slightly longer routing path reads as more deliberate through the window than a cable visibly jammed into a distorted, overstretched grommet.

📏 Checking reach before committing to an alternate route

The fixed 30cm length does limit how far you can shift a route to an alternate opening, so it is worth checking that the alternative genuinely reaches before committing to it - measure from the candidate opening to the socket the lead needs to serve before moving anything permanently. This planning step holds regardless of which finish you have chosen too: the sleeve material itself does not meaningfully change cable thickness, so a transparent kit and a braided one present the identical grommet-fitting challenge. For the wider range this kit sits in, cable solutions is worth browsing, and individually sleeved premium cables covers a custom-length alternative for cases whose grommets are simply too small for six standard extensions.

🔦 A last check before closing up

Shine a torch through each opening once the leads are fed and before the panel goes back on, confirming nothing is pinched or bulging against the grommet's rubber edge. That final look catches a strained fit while it is still trivial to fix.

Frequently Asked Questions

Why do grommets become the bottleneck?

They are sized for factory cables. Six thicker leads plus their junctions ask more of an opening than the case designer assumed.

Should the junction pass through the grommet?

Ideally yes, so only sleeved cable shows. On a tight opening the connector may be what refuses to fit, which changes where it can sit.

How do I avoid tearing a grommet?

Feed gently and never drag a connector housing through under tension. Removing the rubber insert temporarily is better than forcing it.

Can leads share one opening?

Two often can. Three thicker leads through one cutout tends to bulge the grommet and leave the cables crossing where they emerge.

What if an opening is simply too small?

Route that lead through the next opening along. A slightly longer path looks better than a cable jammed into a distorted grommet.

Does the 30cm length limit the alternatives?

It does, so check the alternative route reaches before committing. Measure from the new opening to the socket before moving anything.

Is this worse on the clear series?

The sleeve material does not change thickness meaningfully, so the planning is the same whichever finish you have chosen.

Planning six extensions around your case's grommets? Browse Evetech's power supply range and work out each lead's opening before feeding a single cable through.