Fuse 13amp but states 5amp

[Inverness]

hi oil heads,
Most oil boilers that I service when I isolTe the fuse and take it out, it's never the correct size it should be 13amp most times. Should I leave it or replace it for what it says to be in the spec of boiler manual.

 

[ShaunCorbs]

What manual says / spec

 

[Inverness]

So if I replace it for e.g. 5amp as it says in the manual it will be good and nothing bad can happen

 

[ShaunCorbs]

yep

 

[Murdoch]

13A are just because fused spurs come with them in - and rarely do people bother to fit the correct rating........

Fitting the size indicated by the boiler manufacturer is best .......

 

[Gasmk1]

one of the biggest no no's when corgi or as now known gas safe find wrong fuse size installed, must be to MI's some boilers are 10amp fuse not easy to get hold of (think kestons)

 

[Murdoch]

10A fuses, along with 5A and 3A are easy to buy ....

 

[Last Plumber]

10A fuses, along with 5A and 3A are easy to buy ..

7 Amp too.

 

[Darren Jackson]

Warranty is also invalid if 13 amp fuse is left in. Just redone my ACS 4 weeks ago and this came up. We have to AR the appliance if you come across it as NCS doesn't exist anymore. So just replace it with correct size as per MI's.

 

[Gasmk1]

10A fuses, along with 5A and 3A are easy to buy ..

they are now when i needed some several years ago they were a bugger to find you can even get them from wilko, i had to get thhem from internet search

 

[Best]

I also find most oil boilers I go to have 13 amp fuses. That is if they actually have any switches, fused or otherwise.
I blame the electricians on new builds for doing final wiring to them, as well as the heating installers, but on private houses it is often the plumber at fault.
Seems odd that fused spurs are sold with the maximum sized fuse - 13 amp, yet they could be simply for a fused isolator to supply a mere 10watt led light.
I would want a fuse to blow at the earliest time possible when a fault occurs, like a dead short.
Got to remember a fuse is also to prevent the wiring to the appliances from melting and also the small wires and components of appliances from melting or being destroyed by a dead short, plus avoiding the obvious fire or electrocution risks.

 

[quality]

only 13 and 3 are now listed in the 17th edition and has been that way since the last amendment. The fuse protects the cable not the appliance thats it feeds

 

[Murdoch]

Seems odd that fused spurs are sold with the maximum sized fuse - 13 amp, yet they could be simply for a fused isolator to supply a mere 10watt led light.

Some are sold with 3A fuses

 

[ShaunCorbs]

Some are sold with 3A fuses

any sold without ? maybe the way forward then you can use the appropriate rating / size correctly?

 

[Murdoch]

any sold without ? maybe the way forward then you can use the appropriate rating / size correctly?

The 3A ones are more expensive than the 13A ones ...... I just buy packs of the other sizes of fuses as I need them

Anyone want a bag of 13A fuses?

 

[ShaunCorbs]

The 3A ones are more expensive than the 13A ones .. I just buy packs of the other sizes of fuses as I need them

Anyone want a bag of 13A fuses?

ive got the same but im posh got a case for them all

 

[Harvest Fields]

The 3A ones are more expensive than the 13A ones .. I just buy packs of the other sizes of fuses as I need them

Anyone want a bag of 13A fuses?

You are ok mate. I have a tray load in the van

 

[DaveyHep]

So if I replace it for e.g. 5amp as it says in the manual it will be good and nothing bad can happen

5Amp fuse will be even safererer than a 13Amp fuse. Nothing to worry about.

 

[Stigster]

Got to remember a fuse is also to prevent the wiring to the appliances from melting and also the small wires and components of appliances from melting or being destroyed by a dead short, plus avoiding the obvious fire or electrocution risks.

Yeah I don't think a lot of people realise if they use an overrated fuse, they are effectively turning the cable into the fuse, which is bad.

 

[SimonG]

I carry 3 and 5 for the oil boilers. Very rare to find correct rated fuse in a spur. Customers boiler blew the 5 amp, he changed it with a 13 amp. Originally the transformer took out the 5 amp, but him adding the 13 amp added the control box onto the bill.