Selection reference
| System / material | Rated current | Width (mm) | Height (mm) |
|---|---|---|---|
| LVA · Al | 250 A | 125 | 103 |
| LVA · Al | 400 A | 125 | 113 |
| LVA · Al | 630 A | 125 | 128 |
| LVA · Al | 800 A | 125 | 143 |
| LVA · Al | 1000 A | 125 | 168 |
| LVA · Al | 1250 A | 125 | 203 |
| LVA · Al | 1350 A | 125 | 203 |
| LVA · Al | 1600 A | 125 | 253 |
| LVA · Al | 2000 S A | 125 | 293 |
| LVA · Al | 2000 D A | 125 | 322 |
| LVA · Al | 2500 A | 125 | 392 |
| LVA · Al | 3200 A | 125 | 492 |
| LVA · Al | 4000 A | 125 | 572 |
| LVA · Al | 5000 A | 125 | 685 |
| GMA · Al | 250 A | 78.6 | 60 |
| GMA · Al | 400 A | 78.6 | 80 |
| GMA · Al | 630 A | 78.6 | 100 |
| GMA · Al | 800 A | 78.6 | 125 |
| GMA · Al | 1000 A | 78.6 | 160 |
| GMA · Al | 1250 A | 78.6 | 210 |
| GMA · Al | 1600 A | 78.6 | 250 |
| GMA · Al | 2000 A | 78.6 | 270 |
| GMA · Al | 2500 A | 78.6 | 420 |
| GMA · Al | 3200 A | 78.6 | 500 |
| GMA · Al | 4000 A | 78.6 | 540 |
| GMC · Cu | 400 A | 100 | 60 |
| GMC · Cu | 630 A | 100 | 70 |
| GMC · Cu | 800 A | 100 | 80 |
| GMC · Cu | 1000 A | 100 | 90 |
| GMC · Cu | 1250 A | 100 | 110 |
| GMC · Cu | 1600 A | 100 | 140 |
| GMC · Cu | 2000 A | 100 | 190 |
| GMC · Cu | 2500 A | 100 | 230 |
| GMC · Cu | 3200 A | 100 | 310 |
| GMC · Cu | 4000 A | 100 | 380 |
| GMC · Cu | 5000 A | 100 | 460 |
Source: LVA manual, dimensions and weight table; GM manual §4.2, four-conductor GMC (3P4W), and §7.5, GMA dimensions.
For LVA at 2000 A, S denotes one deck and D two decks.
These are not slab-opening dimensions or safety clearances.
More suitable if…
LVA is more competitive if an indoor residential or commercial riser needs modular distribution; GM is more suitable if the environment requires protection against water.
Not ideal if…
It is not ideal to select by width and height alone: confirm current, neutral, protective earth, environment, orientation and joint access.
Frequently asked questions
Does 400 V determine the size?
No; current, model and conductor configuration determine the straight-section size you should select.
Does 3-phase + neutral include protective earth?
It identifies three phases and a neutral; specify the protective-earth arrangement separately and check the manual.
When should I choose GMA or GMC?
Aluminium GMA is the usual choice up to 4000 A; copper GMC is chosen when the project requires copper or exceeds 4000 A.
Can I use these dimensions for a slab opening?
No; use the approved drawing and the selected model’s installation clearances.
From drawing to estimate
Compare total installed space and labour against parallel cables to find where modular busway can reduce construction work.