electrical supply to megaflo!

[bluesky]

hi all,

we are going to install a megaflo cylinder in a HMO. i had the Unvernted course but never installed one before. I think there is one 2.5mm cable for the boiler, but do i need to run a seperate 2.5mm cable for the immersion heater? or they can share one 2.5mm cable?

cheers

 

[cjg]

but do i need to run a seperate 2.5mm cable for the immersion heater

if you want a fire!!!!!!!!!!!!!!!!!!!!!!

me thinks you need a sparky!! to sort for you.

 

[bluesky]

read the manual, the direct one needs 1.5mm cable, so think 2.5mm can be used for both of the boiler and the cylinder,but not sure...

 

[PlumbBobBob]

pretty sure it needs separate feed.

 

[bluesky]

for the cylinder feed, can i just use a spur off a socket? cheers

 

[PlumbBobBob]

immersions are usually hard wired off a fused spur although i have seen them on three pin plugs as well.

 

[Puddle]

You require to have the immersion on its own dedicated supply from the consumer unit

The boiler can spar off the ring main,not the dedicated supply to the immersion heater


imho

 

[unguided1]

As I recall first of all a dedicated supply from the consumer unit as puddle has stated and I am pretty sure it has to be a 20 amp supply but I would definately get a sparky in if yer not sure also what size mega flo as If its a biggun it may have 2 immersions

 

[BLOD]

agree with puddle & unguided - immersions need a dedicated radial circuit.

 

[GerrythePlumber]

Electrics. We are Plumbers on this forum, and don't take kindly to DIYers. Electricians fill in forms just like us, and don'take kindly to DIYers. Let them do what they do. Three pin plugs on immersion heaters? They would need to be round pins, I think!

 

[furryneddy]

20 amp mcb from consumer unit dedicated supply -1.5 mm T&E min - boiler supply of spurred ring main but must be a FCU

 

[stani]

20 amp mcb from consumer unit dedicated supply -1.5 mm T&E min - boiler supply of spurred ring main but must be a FCU

the max current rating for 1.5mm t&e is 16amps so its no use protecting with a 20 amp mcb, needs to be 16amp mcb otherwise cable could set on fire before the mcb trips.

 

[furryneddy]

the max current rating for 1.5mm t&e is 16amps so its no use protecting with a 20 amp mcb, needs to be 16amp mcb otherwise cable could set on fire before the mcb trips.

Sorry my friend Stani is right 16 amp mcb for that circuit over estimated the power - wonder how many 9.5kw showers have been put in by plumbers on 6mm T&E ????

 

[stani]

loads! and they probably just keep on working day in-day out lol

 

[furryneddy]

loads! and they probably just keep on working day in-day out lol

Yes they do - surprising isn't it but if you took the trouble to touch/feel the cable on some of the longer runs of cable you'd feel just how hot they got not too mention the voltage drop when it get's to the shower.

 

[stani]

our joiner has a 2.7kw chop saw and has been using a 40 metre extension lead to power it,but only pulled off 3 metres, could'nt understand why the saw was only going slow and the cable reel was red hot to the touch

 

[furryneddy]

Well I wonder why that is ? like I said sorry for the mistake in the loading but I don't think it would have made that much difference in the grand scheme of things but better safe than sorry - hope this has been some help to the original post anyway..

 

[ricky1]

Yes they do - surprising isn't it but if you took the trouble to touch/feel the cable on some of the longer runs of cable you'd feel just how hot they got not too mention the voltage drop when it get's to the shower.

Because an uncoiled extension lead reacts as a coil of copper with a voltage and current passing through it