Old MEM 30A Rewireable Fuse / Shower

[emc2jkd1]

deleted

 

[Adam_151]

If you can't get 45A fuse wire, can you twist together 30A and 15A for a makeshift equivalent for an Old MEM 30A rewireable Fuse.

Absolutly not!

A 9.5Kw Shower but 6mm2 cable and not 10mm2 the cable run from CU to shower is only about 7m.

Depends on many factors, but you'd be better off replaceing it with 10mm²

A 63Amp - 30mA RCD also to be connected in line and a 45A pull switch.

This bit sounds fine to me

I know there are better options i.e Change Cu / use 10mm2 / fit RCBO etc.. but would the above work and be safe?

It'd work, but not be safe, you either have to change the cu, or henley in a separate cu next to it

 

[emc2jkd1]

Cheers for that I'll print this off and show the guy.

 

[andy]

If you can't get 45A fuse wire, can you twist together 30A and 15A for a makeshift equivalent for an Old MEM 30A rewireable Fuse.

no. its extremely dangerous and doesnt give you a 45A fuse. and AFAIK, 45A fuse wire/re-wireable cartridges do not exist. youll have to use 45A fuse

 

[ban-all-sheds]

If you can't get 45A fuse wire, can you twist together 30A and 15A for a makeshift equivalent for an Old MEM 30A rewireable Fuse.

I know there are better options i.e Change Cu / use 10mm2 / fit RCBO etc..

So why not take the better options, then?

Cheers for that I'll print this off and show the guy.

What guy? If the above plan has come from the person you propose to have install your shower, find somebody who knows what they are doing instead.

 

[zodiak]

If you can't get 45A fuse wire, can you twist together 30A and 15A for a makeshift equivalent for an Old MEM 30A rewireable Fuse.

Apologies for my ignorance but I have been using a fuse wired like this (Wylex 30A) for over 20 Years. Please explain to a novice why 30A + 15A fuse wire does not add up to 45A rated fuse wire?

A 9.5Kw Shower but 6mm2 cable and not 10mm2 the cable run from CU to shower is only about 7m.

9.5KW @ 230 Volts = 41.3 Amps. Volt drop using a 7 Metres run of 6mm2 T&E cable would be only 2.1 Volts (0.9%). What's wrong with using 6mm2 cable for a 9.5KW shower when the cable run is only 7 Metres long?

 

[andy]

If you can't get 45A fuse wire, can you twist together 30A and 15A for a makeshift equivalent for an Old MEM 30A rewireable Fuse.

Apologies for my ignorance but I have been using a fuse wired like this (Wylex 30A) for over 20 Years. Please explain to a novice why 30A + 15A fuse wire does not add up to 45A rated fuse wire?

because they wil break at different capacities meaning overall you have a fuse rating higher than 45A

A 9.5Kw Shower but 6mm2 cable and not 10mm2 the cable run from CU to shower is only about 7m.

9.5KW @ 230 Volts = 41.3 Amps. Volt drop using a 7 Metres run of 6mm2 T&E cable would be only 2.1 Volts (0.9%). What's wrong with using 6mm2 cable for a 9.5KW shower when the cable run is only 7 Metres long?[/quote]

and what happens when he wants a more powerful shower next year?

 

[pdcelec]

Apologies for my ignorance but I have been using a fuse wired like this (Wylex 30A) for over 20 Years. Please explain to a novice why 30A + 15A fuse wire does not add up to 45A rated fuse wire?

The fuse carrier is also rated at 30A. Would you put brake shoes from your pushbike on your car? You could always put a couple in to make the car stop

 

[ban-all-sheds]

What's wrong with using 6mm2 cable for a 9.5KW shower when the cable run is only 7 Metres long?

How about the fact that the current carrying capacity of the cable might only be 32A, depending on how it has been installed?