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Fusing of fans to comply with manufacturers recommended instructions

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garaoke

garaoke

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Manufacturers want there fans fused to 3a on the permanent feed but the switch wire is still on the 6a MCB doing an eicr is a c2 if there is no RCD protection
 
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Hi - sorry to be a party pooper, but a BS1363 3A fuse is more sensitive to overload than a BS60898 6A mcb. For example, the 3A fuse will always melt at 6A but the mcb will never trip.

[ElectriciansForums.net] Fusing of fans to comply with manufacturers recommended instructions
 
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Charlie_ said:
Manufacturers instructions are usually nonsensical, inappropriate and unattainable; a bit like the serving suggestions on food packaging
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Might be nonsensical but as per The Wiring Regulations which in the UK we have to follow the manufacturers instructions supersede the Regulations and the greatest knowledge of all the electrician
 
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leebut said:
Might be nonsensical but as per The Wiring Regulations which in the UK we have to follow the manufacturers instructions supersede the Regulations and the greatest knowledge of all the electrician
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This is not the case. The regulations ask us to "take account of" manufacturer's instructions. This has recently been changed from the previous wording of "must be followed"

The reason for this is the proliferation of less than useful or appropriate info that is included in some products. Some would ask us to install to lesser standards than BS7671 asks.
 
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leebut said:
Might be nonsensical but as per The Wiring Regulations which in the UK we have to follow the manufacturers instructions supersede the Regulations and the greatest knowledge of all the electrician
Click to expand...

Rubbish. Manufacturers instructions are for guidance only and yes we have to take account of them. But we do not have to follow them, especially when they are wrong.

In this case,
1. FCUs are not needed or used on lighting circuits which are already adequately protected.
2. A 3a FCU offers no discrimination against a 6a MCB in spite of 'Contacts' post above.
3. The fuse is to protect the cable, not the device on the end of it. It would be non compliant for a manufacturer to fit a cable so small it required 3a protection.
4. How would the manufacturers instructions be complied with in all the other countries where FCUs are neither available nor compliant?
 
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