sunbed in house

[mattyevz]

A customer has asked me to put in a supply for a sunbed in his house. He says it needs a 50amp single phase supply. So i was thinking putting in a 50amp c curve mcb from the fuse board which has a spare way fed in 10mm t+ e 10meters then into a rotary switch to the sunbed. The bed has not got an industrial plug. iv never wired a sunbed before, any thoughts? anyone dismantled one to get through the doorway?
thanks peeps

 

[antimatter]

Sounds about right to me, just verify the watts the bed is pulling, then obviously choose the next size MCB up, (ie 50a what you mentioned may be okay, but cable calc it / cable derate just to be sure).

C curve should cope with inrush current, but as always with something like this manufacturers instructions are a must, then you are complying fully with the regs

 

[mattyevz]

they have got an 80amp main fuse iv calculated diversity the 40% rule add up all the breakers x0.4 and it comes out at 76 amps do you think this is abit close ? would you recommend them upgrading to 100amp main fuse? Is this diversity rule acurate?

 

[antimatter]

Even if there is a 80a cut out fuse the sun bed would have to be on for hours and hours th blow that fuse, i think they can take upto 5 x their badge rating, if there is only one sunbed in the house and not much else major (showers, et al) taking power that should be okay, anything else and its a call to the DNO for a cutout upgrade (sometimes free of charge depending on your area and state of the service head) or a get a 3 phase supply installed which isn't cheap i'm afraid matey.

 

[davelerave]

they have got an 80amp main fuse iv calculated diversity the 40% rule add up all the breakers x0.4 and it comes out at 76 amps do you think this is abit close ? would you recommend them upgrading to 100amp main fuse? Is this diversity rule acurate?

i wouldn't rely on that calculation

 

[JUD]

they have got an 80amp main fuse iv calculated diversity the 40% rule add up all the breakers x0.4 and it comes out at 76 amps do you think this is abit close ? would you recommend them upgrading to 100amp main fuse? Is this diversity rule acurate?

The calculation is actually add up all but the largest breaker, multiply by 0.4 and then add on the largest.

This is only a rule of thumb mind.