The 1554EPL is an inner panel for Hammond 1554 and 1555 series enclosures in sizes E and EE. It gives integrators, OEM engineers and panel builders a flat, removable steel plate to mount components, DIN hardware or circuit boards on inside the enclosure, so the build-out can be done on the bench and then installed as one piece. The manufacturer describes it as "1554E INNER PANEL".

The panel is made from 16ga galvanized steel, with the part page listing its colour as Galvanized. Installation hardware is included with the panel.

According to the part drawing, the 1554EPL measures 78.41 mm (3.09 in) by 77.47 mm (3.05 in) overall, with a thickness of 1.63 mm (.06 in). Shipping weight is 0.16 lbs (0.07 kg).

Because installation hardware is included, the panel can go straight into a matching E/EE size enclosure. If mounting screws are lost, Hammond lists 1591MM100 (pack of 100 screws) as the replacement screw for all sizes other than A and B. The panel is RoHS compliant and REACH compliant, is catalogued under product category Accessories with UNSPSC 39121301, and carries UPC 623980843025 for receiving and inventory matching.