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In a UK domestic dwelling would/should you wire an oven and/or hob in H07 Flex or T&E (PVC/PVC)?

Sergio Fernandez

Some MI (manufacturers instruction) for oven and/or hob state H07. 

Some MI for Cooker Outlet Plate state T&E. 

Some MI for the oven and/or hob/Cooker Outlet Plate lack any guidance and say consult a qualified electrician. 

Another thing to consider is, if the MI for oven and/or hob state H07 and MI for Cooker Outlet Plate states T&E, are they incompatiable?  Personally I think H07 Flex should be used for Oven/Hob thus the oven/hob can be removed for cleaning or maintenance purposes.  It is also heavy-duty rubber designed to provide high flexibility and to withstand chemical, mechanical and thermal stresses and normally UV stable.  It would be nice to see what BS7671 states and what the community thinks and what the manufacturers state or  think.

Parents

  • I have seen both, but I do not like T&E in situations where it is called upon to behave as a flex  - so a built-in oven in a cupboard frame  that never moves is far less of a concern than a free-standing cooker that gets pulled out to mop the floor beneath every  few weeks. I have would no issue with the right size of HO style flex in either situation. 

    I have been known to use crimp bootlace ferrules or even pin-crimps  on fine stranded wire in terminals in things like isolators that do not grip it properly otherwise.

    Also in the mix of things to consider  some cooking appliences have terminals that on inspection are really only suited to flex and are sometimes unhappily forced to take wire that is too stiff and are then mechanically stressed.

    Somtimes a bit of local 'professional opinion' over-rules maker's instructions that were cleary written for a different situation (or sometimes written for a totally fictional situation it feels like.. )
    Mike


    PS

    Bootlaces Pin crimps for fine stranded wire

  • in reply to mapj1

    I agree with you there Mike.  Some ovens need a Flex with a crimp or Ring crimp on the end. 

  • in reply to Sergio Fernandez

    According to regulation 521.9.3, rigid cables are permissible in the absence of vibration.

  • in reply to AMK

    It would then depend on how many time the customer pull the oven out?  This would be for a free standing oven so they can clean underneath if in a cupboard then it may never come out unless there is a fault or a diligent IECR or Pat.

  • in reply to AMK
    AMK said:
    According to regulation 521.9.3, rigid cables are permissible in the absence of vibration.

    Fan ovens have inherent vibration.

    Sergio Fernandez said:
    It would then depend on how many time the customer pull the oven out?

    Perhaps ... might also depend on:

    • Sources of vibration close to, or within, the oven itself
    • Manufacturer's guidelines/instructions (if any)
    • Type of terminals or connectors (for example, some have a rewirable connector suitable for flex, or are provided with a connector with flex).
    • Type of cable restraint and how that works.
    • How the manufacturer envisages the oven will be repaired and/or serviced.
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  • in reply to AMK
    AMK said:
    According to regulation 521.9.3, rigid cables are permissible in the absence of vibration.

    Fan ovens have inherent vibration.

    Sergio Fernandez said:
    It would then depend on how many time the customer pull the oven out?

    Perhaps ... might also depend on:

    • Sources of vibration close to, or within, the oven itself
    • Manufacturer's guidelines/instructions (if any)
    • Type of terminals or connectors (for example, some have a rewirable connector suitable for flex, or are provided with a connector with flex).
    • Type of cable restraint and how that works.
    • How the manufacturer envisages the oven will be repaired and/or serviced.
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