Klik plug and sockets

[dokkan1080]

Klik plugs are rated at 6 amp with 075mm flex.

But I have seen them used on 10 amp breakers in shops and the like with the plug in Rose's and with the Marshallling boxs?

How does that work if the plug is only 6 amp

Is it due to the flex length being so short or something else?

 

[IAmSparkytus!]

Generally when people fit klik boxes they want to provide a local isolation for each individual light fitting. By doing so, each klik plug will only draw the load from 1 light fitting. If a light fitting is an LED panel say, it will only draw approx 40W meaning each klik plug will only be taking 40W of load.

Its the cable feeding the klik box itself which needs to be rated high enough for the 10A MCB as this is the cable where the load from all the klik plugs combined will travel.

 

[littlespark]

It’s been mentioned a few times already, but it’s exactly the same situation as a domestic pendant.

1.5mm on a 6A supply going to a rose.... 0.75 flex down to lampholder.
All that the 0.75 flex is taking is one lamp.
In the cliks case, one fitting.

Or, unfused spur from an rfc? a 2.5 cable that can only carry 26A, on a 32A OCPD
The load on the end of the cable is limited to 2 x13A fuses.

 

[Lucien Nunes]

So a rated at 6 amp 0.75 klik plug flex connected into a marshaling box supplying a light can be used on a 10 amp circuit breaker

Yes. The MCB protects the flex against short-circuit, the fixed load protects it against overload. 0.75mm² flex can handle 6A continuously. To overload the flex without tripping the 10A breaker, the load would have to draw a current between 6A and 14.5A. For this to happen, a fixed lighting load such as a 40W LED driver would in theory be disspating over 6 * 230 = 1400W and would immediately self-destruct, becoming either become short-circuit (and trip the MCB) or open-circuit. In reality it will have some internal protection of its own such as a 1A fuse or fusible resistor that will open long before the cable rating is exceeded.

 

[pc1966]

As Lucian has explained, you have two requirements for protection:

• Fault protection (eg. short)
• Overload protection (e.g. too much plugged in to on a set of sockets)

Usually you must have fault protection (with only a few special exceptions), however, overload protection is not explicitly required for fixed loads.

Here the MCB is only providing fault protection, so as long as the MCB's disconnection time is acceptable and the let-through energy (i.e. the I2t) is below the cable's adiabatic limit for not damaging the insulation for an infrequent event, all is OK.

Overload protection is not normally needed on a per-light basis, as Lucian explained. Thankfully we no longer have those adaptors to allow appliances to be plugged in to a bayonet socket!

However, for anything with multiple load points that can be plugged in you would normally need overload protection, so the light circuit MCB ought to be coordinated with the main cable(s) feeding the lights, just as you would for the MCB protecting socket outlets. But smaller, obviously!

 

[sinewove]

You can wire pendant sets to 16A lighting circuits and they are only rated 2A! There is a regulation mentioning 0.75mm flex being suitable for connecting lights to lighting circuits with circuit protection rated above the CCC of the flex. But I'm too lazy/tired

I bet many would code a 16A MCB on domestic lighting C3 or 2 though its allowed ,subject to installation method.
S

it...

 

[Dustydazzler]

I bet many would code a 16A MCB on domestic lighting C3 or 2 though its allowed ,subject to installation method.
S

Loads of commercial/ industrial lighting is wired in 2.5 on a 16a radial

 

[LastManOnline]

There is a regulation mentioning 0.75mm flex being suitable for connecting lights to lighting circuits with circuit protection rated above the CCC of the

Correct me here if I, m wrong but I believe the regs allow pendants to be wired in 0.5mm.I,ve noticed a growing number of manufacturers taking advantage of this. I recently I stalled a 100 watt globe (Robus) that had a lead attached that was 0.5mm MAX

 

[loz2754]

Table 52.3
Flexible cables minimum CSA 0.75mm
0.5mm is allowed for signal and control cables.

The exception would be within a specific appliance, where the product standard would indicate the minimum CSA.

 

[LastManOnline]

0.5mm is allowed for signal and control cables.

The exception would be within a specific appliance,

? . 0.5mm min is allowed for pendants here(though never seen in practice). As, mentioned in my previous comment though, it's, certainly applied by some lighting manufacturers