Socket with slimest back connections?

[Mark Wright]

No I mean theres two faults, malfunction transformer and broken leg.

One of the reasons we use fused plugs in the UK is because we use rings.

 

[DPG]

No I mean theres two faults, malfunction transformer and broken leg.

One of the reasons we use fused plugs in the UK is because we use rings.

Ah I'm with you.

The USB sockets will have circuit protection built in if they are built to the appropriate standard.

 

[davesparks]

it does seem a bit dodgy - the transformer malfunctions fine the MCB trips but on a ring there is also a broken leg and 32A MCB = fry time.

If the power supply for the USB outlets fails then the protection built in to that unit will operate.

A broken ring won't change how an MCB responds to a fault, it only affects overload situations.

 

[Mark Wright]

Possibly but on a ring it probably should be fused.

 

[davesparks]

Possibly but on a ring it probably should be fused.

How do you know they aren't suitably protected? Have you opened them up to have a look?

These units are built to an appropriate product standard and designed specifically to be installed in UK installations.

 

[Mark Wright]

Anything plugged into a Ring should be fused in case of a broken leg. With a broken leg it becomes a radial wired in 2.5 and a 32A MCB will not provide adequate protection.

 

[DPG]

Anything plugged into a Ring should be fused in case of a broken leg. With a broken leg it becomes a radial wired in 2.5 and a 32A MCB will not provide adequate protection.

No, see my previous comment. The socket will have built in protection, otherwise it would not meet the BS standards.

Edit, not sure I understand your point. I was answering your previous point about USB sockets not being fused.

 

[davesparks]

Anything plugged into a Ring should be fused in case of a broken leg.

No, that's not why plugs have fuses in them.

The fuse in the plug is there to protect the flexible cable downstream of it.

The plug fuse does nothing to help in a broken ring circuit.

 

[Mark Wright]

There not fused though are they?

Investigation into UK socket-outlets incorporating USB charging points | Electrical Safety First

Investigation into UK socket-outlets incorporating USB charging points Electrical Safety First investigated a number of commercially available UK socket-outlets

www.electricalsafetyfirst.org.uk

 

[Mark Wright]

"Previously, each mains socket had its own connection to the fuse board. To save copper, Britain adopted the ring main system, with sockets connected sequentially, but this meant each connection needed its own fuse. Instead of putting the fuses in the sockets, they were included in the plugs themselves."

Fused plugs are only required in the UK where we use Rings.

the flex is protected by the Fuse/MCB at the DB on a radial.

 

[DPG]

There not fused though are they?

Investigation into UK socket-outlets incorporating USB charging points | Electrical Safety First

Investigation into UK socket-outlets incorporating USB charging points Electrical Safety First investigated a number of commercially available UK socket-outlets

www.electricalsafetyfirst.org.uk

That report covers many types of fault, not just over current protection.

 

[Avo Mk8]

Not going too off topic but technically now you mention it an unfused supply off a ring? maybe theres a reg being broken there.

If you are talking about USB 13A sockets, since 2016 when the socket British Standard was revised to cover built-in electronics, the design has to incorporate a fusible link or fuse, and the psu must be SELV, meeting creepage and clearance distances and transformer insulation requirements etc. etc.
USBs got off to a bad start before that revised standard, when the market was flooded with dubious products, though I think China also makes 'proper' ones now.
But these days I like to think if you buy an approved product from a reputable manufacturer/source, there should no longer be a problem!
Newer technology allows a phone or tablet you plug in to negotiate with the USB charger what voltage/ current it wants.
I guess you could say that's that's an added safety feature, or something else to go wrong!

 

[Mark Wright]

If you are talking about USB 13A sockets, since 2016 when the socket British Standard was revised to cover built-in electronics, the design has to incorporate a fusible link or fuse, and the psu must be SELV, meeting creepage and clearance distances and transformer insulation requirements etc. etc.
USBs got off to a bad start before that revised standard, when the market was flooded with dubious products, though I think China also makes 'proper' ones now.
But these days I like to think if you buy an approved product from a reputable manufacturer/source, there should no longer be a problem!
Newer technology allows a phone or tablet you plug in to negotiate with the USB charger what voltage/ current it wants.
I guess you could say that's that's an added safety feature, or something else to go wrong!

I'd be interested to know if these sockets do have a fused link or fuse.

But really I'm only referring to Rings etc Even if you took a selv spur of a Ring you have to fuse it.

 

[MJPD29]

Just a thought, mk usb sockets advertise as fitting 25mm box, not sure about how well 3 cables would fit though.

 

[davesparks]

But really I'm only referring to Rings etc Even if you took a selv spur of a Ring you have to fuse it.

SELV spur? What on earth is that?

 

[Mark Wright]

I've seen a few I'm going to investigate. But I think Dave's post about the collar has cracked it.

 

[mainline]

Not going too off topic but technically now you mention it an unfused supply off a ring? maybe theres a reg being broken there.

You lost me

 

[Mark Wright]

SELV spur? What on earth is that?

hehe why not

 

[Avo Mk8]

I'd be interested to know if these sockets do have a fused link or fuse.

Well if the socket has a CB mark from an accredited test house, then it must have (eg. a fusible link - typically looks like a resistor!)

 

[mainline]

hehe why not

I can see the purpose of having a 1:1 transformer socket outlet.