Velux Integra wiring

[walkern]

Hello,
The velux Integra comes with a 13 amp fuse to power a 12v motor. I'm a bit confused why as I'd have thought it draws almost no power to warrant a 13a fuse.

I'm saying because I want to wire this to the lighting circuit so change it to a 5 amp fused switch...

The velux technical guides are less than useless. Anyone got any knowledge on whether what I want to do is ok?

 

[EFLImpudence]

Fuses etc. are to protect the cable, not the appliance.

If you connect it to the "lighting" circuit, you will not need a fuse at all, just a switch.

 

[walkern]

Ok, ignore the lighting circuit bit, what I mean is the plug has a 13a fuse, so would putting a 5 amp in blow the circuit when the motor starts, as i can't see it drawing more than 5 amps, so why fit a 13 amp fuse?

 

[EFLImpudence]

Ok, ignore the lighting circuit bit, what I mean is the plug has a 13a fuse, so would putting a 5 amp in blow the circuit when the motor starts, as i can't see it drawing more than 5 amps, so why fit a 13 amp fuse?

Manufacturers tend only to fit 3A or 13A fuses.

If the cable is suitable for a 13A fuse (or vice versa) and the load draws less than 13A, then nothing else matters.

If the motor should draw (I don't know) more than 6A (when starting) the it may not be suitable for fitting to the "lighting" circuit.

 

[walkern]

Ok. I'll contact velux as I cannot find any electrical information in the manuals.

 

[walkern]

Just spotted a tiny bit in the book:

230v - 50hz 40VA
2 * 1.5mm cable

So that's less than an amp and the cable is only rated for 5amp?

 

[winston1]

Ok, ignore the lighting circuit bit, what I mean is the plug has a 13a fuse, so would putting a 5 amp in blow the circuit when the motor starts, as i can't see it drawing more than 5 amps, so why fit a 13 amp fuse?

Because as EFLImpudance told you the fuse is to protect the cable not the appliance.

 

[winston1]

Just spotted a tiny bit in the book:

230v - 50hz 40VA
2 * 1.5mm cable

So that's less than an amp and the cable is only rated for 5amp?

1.5mm cable is rated at a lot more than 5 amps.

 

[JohnW2]

1.5mm cable is rated at a lot more than 5 amps.

... and 40VA at 230V is an awful lot less than 5A !

Kind Regards, John

 

[walkern]

1.5mm cable is rated at a lot more than 5 amps.

I see I've got to be very precise here

What I meant was 1.5 is lighting circuit gauge not ring main gauge...

 

[winston1]

I see I've got to be very precise here

What I meant was 1.5 is lighting circuit gauge not ring main gauge...

No it is not. Lighting circuits normally use 1.0mm cable. There is no such thing as "lighting circuit gauge", or "ring main gauge". Appropriate cables are used depending on requirements.