Good morning,
We want to install a conduit with underground cable in the garden for 1-2 outdoor sockets. We plan to run the underground cable inside the conduit to protect it and allow for replacement.
The conduit would end just before the outdoor socket (pedestal socket) underground and exposed to the elements.
How can we properly seal the end to prevent water, sand, dirt, or animals from entering the conduit?
Should we foam the end of the conduit? If yes, with what?
Or should we use a waterproof heat-shrink sleeve?
Or is there another recommended method?
We only want to install one underground cable 3x2.5mm inside the conduit, so DN25 should be sufficient, right?
Can you recommend a conduit?
We want to install a conduit with underground cable in the garden for 1-2 outdoor sockets. We plan to run the underground cable inside the conduit to protect it and allow for replacement.
The conduit would end just before the outdoor socket (pedestal socket) underground and exposed to the elements.
How can we properly seal the end to prevent water, sand, dirt, or animals from entering the conduit?
Should we foam the end of the conduit? If yes, with what?
Or should we use a waterproof heat-shrink sleeve?
Or is there another recommended method?
We only want to install one underground cable 3x2.5mm inside the conduit, so DN25 should be sufficient, right?
Can you recommend a conduit?
F
FrankChief2 May 2024 10:38@Michilo I’m not worried about the future; the 3x2.5mm cable will definitely be sufficient for us since we only plan to connect small devices to the outlets.
I was considering the conduit mainly so that it can be replaced later if it gets damaged, for example, if it’s hit with a shovel or something similar, or if an animal gnaws on the cable.
After we install the conduit and cable, we will have part of the area paved over it, making it harder to access.
I was considering the conduit mainly so that it can be replaced later if it gets damaged, for example, if it’s hit with a shovel or something similar, or if an animal gnaws on the cable.
After we install the conduit and cable, we will have part of the area paved over it, making it harder to access.
FrankChief schrieb:
I only considered the empty conduit so that it could be replaced in the future, Then you also need to include a pull wire for a new cable, and so on.
M
motorradsilke2 May 2024 20:44FrankChief schrieb:
@Michilo I’m not worried about the future; the 3x2.5mm cable will definitely be sufficient for us, as we only plan to connect small appliances to the outlets.
I only considered the conduit to allow for future replacement in case it gets damaged, for example if it’s hit by a shovel or similar, or if an animal gnaws on the cable.
After we install the conduit and cable, we will have part of it paved over right away, so it won’t be so easily accessible anymore.If you pave over it, then you don’t need to worry about hitting it with a shovel. There are also plastic warning tapes in different colors (I’m not exactly sure what they are called) that you lay in before covering, slightly thicker than the shovel blade. When someone digs there later, they will hit the tape first and know that cables are underneath.
M
MachsSelbst2 May 2024 23:50This is called a warning tape for utility lines. However, it only helps if the excavator operator knows there is a line there and digs carefully until the tape appears on the bucket, and/or if a not-so-bright… um, colleague is standing in the trench cautiously probing with the shovel.
Conduits are installed to allow for easy cable pulls later on. You don’t necessarily need a pull wire for this; a cable-blowing tool ("cable rocket") can often work, sometimes even better than a pull wire. If, over a distance of 30 or 40 meters (about 100 or 130 feet), a LiYCY cable is pulled in, as electricians often do, it can simply snap under some resistance... and then you’re left standing there looking confused.
Direct burial cables, such as NYY for the low-voltage main distribution board (NSHV) area or the equivalent for voltages above 1 kV, are commonly installed by any professional company directly in the ground without protective conduit, because these cables are designed for that purpose.
A different topic:
If an NYY cable is installed inside a conduit, it’s also worth considering the current-carrying capacity. It does not necessarily have to be 16 A for a 1.5 mm² conductor anymore. The soil cools the cable (beyond a certain burial depth), while the conduit insulates it due to the air inside...
Conduits are installed to allow for easy cable pulls later on. You don’t necessarily need a pull wire for this; a cable-blowing tool ("cable rocket") can often work, sometimes even better than a pull wire. If, over a distance of 30 or 40 meters (about 100 or 130 feet), a LiYCY cable is pulled in, as electricians often do, it can simply snap under some resistance... and then you’re left standing there looking confused.
Direct burial cables, such as NYY for the low-voltage main distribution board (NSHV) area or the equivalent for voltages above 1 kV, are commonly installed by any professional company directly in the ground without protective conduit, because these cables are designed for that purpose.
A different topic:
If an NYY cable is installed inside a conduit, it’s also worth considering the current-carrying capacity. It does not necessarily have to be 16 A for a 1.5 mm² conductor anymore. The soil cools the cable (beyond a certain burial depth), while the conduit insulates it due to the air inside...
F
FrankChief7 May 2024 10:16Thanks for your replies.
Doesn’t it generally make sense to install the cable inside a conduit?
We plan to install underground cable NYY-J 3x2.5 mm² (3x2.5 mm²) for approximately 25 meters (82 feet).
Would you install the cable without a conduit? I thought it definitely makes sense so that the cable can be replaced if needed (in case it gets damaged by something like water, a shovel, or other causes).
Without a conduit, replacing the cable under the paved area would not be easy anymore. Another part of the cable runs through a flower bed.
A 50-meter (164 feet) M25 conduit costs €50.
Would you just leave the end open and let water and dirt enter?
Doesn’t it generally make sense to install the cable inside a conduit?
We plan to install underground cable NYY-J 3x2.5 mm² (3x2.5 mm²) for approximately 25 meters (82 feet).
Would you install the cable without a conduit? I thought it definitely makes sense so that the cable can be replaced if needed (in case it gets damaged by something like water, a shovel, or other causes).
Without a conduit, replacing the cable under the paved area would not be easy anymore. Another part of the cable runs through a flower bed.
A 50-meter (164 feet) M25 conduit costs €50.
Would you just leave the end open and let water and dirt enter?
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