Advice on connecting stiff 70mm² DC cable to MultiPlus-II 48/5000 (Belgium, AREI)

DIY
,
1

Hello everyone,

I’m currently installing a Victron MultiPlus-II 48/5000. According to the documentation, 70 mm² DC cable is required, so I want to stick to that.

To comply with Belgian AREI regulations (cable in a duct/bundle), I chose a B2ca RZ1-K 70 mm² cable (Topcable). However, I’m running into a problem: the cable is so stiff that making the bend to the MultiPlus terminals almost mechanically stresses the clamps—not ideal.

The classic flexible welding cables (H01N2-D) or battery cables are much easier to handle, but as far as I know, they do not have the required fire reaction class for this type of installation.

My questions:

  • How do you guys handle this so that it fits physically and stays AREI-compliant?

  • For a 48/5000, is 70 mm² really necessary? I often hear that 35–50 mm² is actually sufficient.

Any tips or experiences are welcome!

PS: I’ve attached a photo showing the furthest I can bend the cable without putting too much stress on the MultiPlus terminal.

image
image1152×2048 341 KB

image
image1920×1440 413 KB

2

PS2: Yes, I know the AC side is currently using H01N2-D. That was a mistake on my part and it will be replaced before inspection as this is Eca cable that is not allowed in ducts or bundles.

3

Nice build the biggest issue I had with 95mm2 is the lug as you can’t get it square on with the cable so I use a cone bit to taper the lug so it can just be ribbed over the threaded bolt and I would say if you could warm the cable it may help you out too

4

tapering the lug might indeed just give me the marge i need to get it over the thread. the straighter it gets, the more easy it should go.
I’ll test with the current testcrimp before cutting away at my multiplus.

5

Let us know how it goes

6

I got it on there after tapering the lug. Wonderfull. (Yes i know I need to crimp a new lug to the cable)

AB652443-C206-4F8D-8145-F3633C7773B5
AB652443-C206-4F8D-8145-F3633C7773B51920×3413 1.36 MB

But now i get the next issue with this cable not being flexible enough. I made some 3D printer molds to force the cables to use the biggest radius there is available. Guiding me in how to bend each cable.

IMG_2726.HEIC
IMG_2726.HEIC3024×4032 2.58 MB

But i just cant make the bends that i need.

Any of you have any experience with cabling in Belgium?
The Victrons manual states that I need a 70mm² cable for MultiPlus-II 48/5000 class 6
Belgium AREI (Inspection of your electrical installation) requires that cables in ducts are rated Cca (fire rating)

Issue is that a Cca class 6 cable does not exist. So the cable I have is class 5 but this is just to stiff to bend.

My question what cable are you useing, and did it get approved in Belgium?