Can I connect an outdoor socket to a junction box which feeds my garage?

[banksey88]

My next question is… how many sockets can I add? My plan is to only add the one at the moment, but may add more in future in a radial?

Would I need a switched connection unit if I was to add more sockets? The main MCB is currently rated at 16A and is also powering the garage.

 

[littlespark]

You can have what you like as everything is protected by the 16A.
Depending of course that the cable used to supply the sockets can carry more.

 

[pc1966]

If the supply MCB is 16A than any power cable (1.5mm or larger) is fine if not heavily insulated or hot zone and no realistic limit to number of sockets.

But...you are obviously limited to 16A total! Also some larger loads with motors like chop saws, etc, might take enough of a start-up surge to trip a 16A B-curve MCB. Going for a 16A C-curve might be an option but really then you need to do a bit more design and testing.

Ultimately your cable run and loads are limited by one or more of the following:

• Current carrying capacity of the cable (mostly conductor size, but also thermal insulation of its route / installation method)
• Voltage drop (should be less than 5% at max load)
• Fault impedance to disconnect fast enough (usually met if VD met)

For guidance, a 16A circuit on 1.5mm T&E should be limited to 27m (or 15m if C-curve depending on supply Ze, typical TN-S limit). If it is in 2.5mm (more likely as safe for greater range of installation methods) then 45m (or 24m C-curve).

 

[banksey88]

If the supply MCB is 16A than any power cable (1.5mm or larger) is fine if not heavily insulated or hot zone and no realistic limit to number of sockets.

But...you are obviously limited to 16A total! Also some larger loads with motors like chop saws, etc, might take enough of a start-up surge to trip a 16A B-curve MCB. Going for a 16A C-curve might be an option but really then you need to do a bit more design and testing.

Ultimately your cable run and loads are limited by one or more of the following:

• Current carrying capacity of the cable (mostly conductor size, but also thermal insulation of its route / installation method)
• Voltage drop (should be less than 5% at max load)
• Fault impedance to disconnect fast enough (usually met if VD met)

For guidance, a 16A circuit on 1.5mm T&E should be limited to 27m (or 15m if C-curve depending on supply Ze, typical TN-S limit). If it is in 2.5mm (more likely as safe for greater range of installation methods) then 45m (or 24m C-curve).

Thank you. If I run in more than 1 socket, do I have to run the next socket off the previous one like a radial? Or can I run 1 socket 1 way from the junction box, and one socket the opposite way from the junction box (wago connected inside).

 

[pc1966]

Thank you. If I run in more than 1 socket, do I have to run the next socket off the previous one like a radial? Or can I run 1 socket 1 way from the junction box, and one socket the opposite way from the junction box (wago connected inside).

You can do ether, but obviously have to have the appropriate number of terminal holes to do so (5-way Wago as they don't make 4-way).

However you do it, make sure it is obvious and/or suitably labled to allow future fault-finding. It might be someone else who knows nothing about your reasons, or you if a few years time when you forget!