Dedicated 13amp appliance

[DetlefSchmitz]

Invoking the fair quotation law:

Untitled

• DetlefSchmitz
• 11 Jul 2014
• 1

 

[Taylortwocities]

So, 1.25mm² minimum for a 13amp load.

That's assuming the load really is 13amp. But as the OP has contributed ZERO since his original post, I conclude that he is no longer interested, or his house has burnt down

 

[JohnW2]

Invoking the fair quotation law:...

Thanks. Does the associated text help to make any sense of it?

Even forgetting the ('hard-to-understand') 'dispensation' for 0.75mm² flex (with certain conditions) which Risteard referred to, there are still aspects of this table which don't make a lot of sense.

As a minor issue, why is their 'current rating' figure for 1.5mm² different from the BS7671 figure? Much more to the point, even on the basis of the figures they do tabulate, in at least two cases they state a 'maximum fuse rating' which is higher than the figure they give for the 'rated current' of the flex - which seems somewhat at variance with electrical common sense (not to mention BS7671).

Kind Regards, John

 

[securespark]

I'm struggling a bit

Don't shoot the messenger!!

Ask eric, I think he contributed to the same IET forum thread!!

 

[JohnW2]

So, 1.25mm² minimum for a 13amp load.

Indeed- as I indicated at a start, that's what BS7671 says.

That's assuming the load really is 13amp.

As we've often discussed, even if the (normal) load is less than 13A, BS7671 would, I think, still require 1.25mm² minimum unless (a) it could be successfully argued that the nature of the load was such that it could not create an overload and (b) (probably usually satisfied) there was adequate fault protection for the cable. Of course, some will even debate whether appliances flexes come within the scope of BS7671 - but that seems a bit silly to me, particularly in the case of a hard-wired appliance.

... But as the OP has contributed ZERO since his original post, I conclude that he is no longer interested, or his house has burnt down

Given that it's only about 24 hours, there are probably plenty of other possible explanations - not everyone spends their entire life in front of a computer I would personally be inclined to wait a bit longer before getting too critical!

Kind Regards, John

 

[DetlefSchmitz]

Does the associated text help to make any sense of it?

Along the lines of:

If a plug wired on to the end of a cable is not supplied for a specific use then the free end shall be marked with the maximum current that the equipment it is wired to is allowed to take, according to table 2.

I couldn't see any other references, but I need to get back to work!

 

[JohnW2]

I'm struggling a bit

Don't shoot the messenger!!

Don't worry, I don't shoot messengers (not the least because I am often 'the messenger' myself, and hence hope that others will follow my non-shooting example ). In any event, we now seem to have established that BS1363-1 does, indeed, say these things in its Table 2 - but, as I've said, I think we now need to discover whether the associated text helps to make any sense of it!

Kind Regards, John

 

[JohnW2]

Does the associated text help to make any sense of it?

Along the lines of: "If a plug wired on to the end of a cable is not supplied for a specific use then the free end shall be marked with the maximum current that the equipment it is wired to is allowed to take, according to table 2.

Thanks again. However, I'm not sure that qualifies as 'helping to make any sense of it" - if anything, it raises even more questions!

Kind Regards, John

 

[securespark]

That sounds startlingly familiar!

 

[Mike2007]

Its a 13amp rated AGA cooker

 

[securespark]

What does it recommend in the instructions?

Do you know the total load?

Does the cable need to be heat resistant?

 

[ban-all-sheds]

Invoking the fair quotation law

Is that a UK law, or a US one?

 

[DetlefSchmitz]

Invoking the fair quotation law

Is that a UK law, or a US one?

UK - usually known as 'Fair Dealing'. Yes I didn't mention the source, but that was obvious in context.

 

[ericmark]

It states 3 core silicon - SIHF insulation cable design current 10.5 - 11 amp with a 13A supply I selected a random PDF on AGA it states IEE rules must be followed yet it says it can be plugged in like a kettle and since over 2kW that would not be in-keeping with today's IET rules.

If it were me I would use Heat Resistant Flexible Cable 3183TQ 3-Core 1.5mm² x 5m White although that's not a silicon cable but it is available in short lengths and locating any other cable may not be so easy.

It should following IET rules have a dedicated supply but the whole idea is to have the unit always hot so it will only draw power to top up the heat with a 35kW rating per week it averages at 0.2kW which on average is not that high. Personally I would not consider this item as suitable for supply from a standard ring final circuit but there will not likely be a problem.

 

[JohnW2]

... it states IEE rules must be followed yet it says it can be plugged in like a kettle and since over 2kW that would not be in-keeping with today's IET rules.

If by 'IET rules' you are referring to the guidance in ('informative') Appendix 15 of BS7671 about measures which are advised for avoiding overloading of a ring final circuit, all it suggests is that cooking appliances >2kW should not be supplied by a ring final - but, instead, should have dedicated circuits. It says nothing about not using plugs/sockets.

Kind Regards, John