A standard off-the-shelf distribution board works for a home or small office, but it isn’t built to the current ratings or modularity that a factory, hospital, or large commercial tower’s main and sub-main boards require — that’s the specific gap Legrand’s XL³ system fills.
What makes XL³ different from a standard board?
XL³ is a modular system assembled from enclosure, busbar, and mounting components to match a project’s exact current rating and way-count, rather than a fixed off-the-shelf size — and it’s rated for far higher current than Legrand’s standard DX³ domestic/light-commercial range.
- XL³ 160/400 — sub-main distribution boards in commercial buildings
- XL³ 800/4000 — main distribution boards in industrial and large commercial installations
How do you know if a project needs XL³ instead of a standard DX³ board?
If the board is a main or sub-main board on an industrial, hospital, or large commercial project — rather than a final-circuit board in an individual unit or small office — it calls for XL³ rather than a standard off-the-shelf board.
Residential and small commercial DBs almost always stay within the standard DX³ range; XL³ becomes relevant once a project’s electrical design steps up to main-panel-level current ratings.
What does ordering an XL³ board involve, compared to a standard DB?
Because XL³ is modular rather than fixed-size, ordering typically starts with Fembosco’s engineers reviewing the project’s single-line diagram, rather than picking a way-count off a standard product list.
This makes XL³ a more involved specification process than a standard DB order, but it’s what allows the system to be built to the exact rating a large project needs rather than over- or under-sizing against a fixed catalog option.
Frequently Asked Questions
Is XL3 ever used in residential buildings?
Rarely — XL3 is specified for commercial and industrial main/sub-main boards; residential and light-commercial DBs are more cost-effectively served by Legrand’s standard DX3 range.
What does Fembosco need to quote an XL3 board?
A single-line diagram, or at minimum the required current rating, phase configuration, and way-count, lets Fembosco’s engineers put together an accurate specification.
Conclusion
Reach for XL³ once a board’s role is main or sub-main distribution on an industrial or large commercial project — for everything else, a standard DX³ distribution board is the simpler and more cost-effective specification.