My Mate (lives in a pub) has a 14-way (i think) GET CU. All MCB's are protected by the 80A RCCB. However, there are 10 MCB's comprising 3x32, 5x20, 2x16A. He also wants to connect a 8.5kW shower to it. By my calculation this would be a 40A. so, including the shower MCB, the total value would be 268A. How can the shower be connected. Any advice?
How can a shower be connected to this?
- Thread starter xAlex
- Start date
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Diversity 
Not all the circuits will be drawing full load at all times.
Not all the circuits will be drawing full load at all times.
...would it be OK to connect the 40A then Davy?
xAlex said:
It is up the the installer to determine maximum demand and account for any allowable diversity. Whether the MD after diversity is still low enough will depend on what loads the existing circuits feed. Not all circuits can have diversity applied - instant water heaters are one example (showers, over sink water heaters etc).
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xAlex said:
Then the nuisance tripping will be a problem, esecially as all the lights will go out, as well as his fire and intruder alarms and the chillers. this is very undesirable in a public building where some of the people will be drunk and unruly.
He should spend some of his money on RCBOs for the circuits that need RCD protection
Or as a very poor second best, a split-load CU
So, if after the addition of the design currents of all the individual circuits, allowing, where appropriate for diversity, the demand is more than 40A, the 40A for the shower cannot be installed. (as the RCCB is just 80A). Correct??? Can the RCCB be up-rated? Any other options?
Sure, you can get RCCBs rated at 100A but the basic issue is the RCCB is a single point of failure and the board should be re-architected (is that a correct word?)
Now, can the board/installation support an additional 8.5KW - ther's no diversity allowed on this, it all or nothing. You need to get a spark to look at what is also being used in the pub - especially the kitchen. You may have issues if the shower is used when the deep fat fryer and the oven are on at the same time for instance......
I always wonder why people need a power shower. Is there hot and cold water in the bathroom already? If the problem is water pressure then a shower pump should be all that you need.
Now, can the board/installation support an additional 8.5KW - ther's no diversity allowed on this, it all or nothing. You need to get a spark to look at what is also being used in the pub - especially the kitchen. You may have issues if the shower is used when the deep fat fryer and the oven are on at the same time for instance......
I always wonder why people need a power shower. Is there hot and cold water in the bathroom already? If the problem is water pressure then a shower pump should be all that you need.
No one has asked this yet, so I'll be the first.
What type and size supply is there to the pub? (the whole property)
This CU you refer to, I assume this is the CU just for the flat? It sounds woefully undersized for the whole pub to run off.
What type and size supply is there to the pub? (the whole property)
This CU you refer to, I assume this is the CU just for the flat? It sounds woefully undersized for the whole pub to run off.
The installation is shabby. There are 2 consumer units and one semi-enclosed fuse type box with 4 fuses. I'm not sure what the total load is. The semi-enclosed is for the top floor (flat), and the 1st floor with the shower and a lodger, and the ground floor with all of the pub equipment etc are mixed in the other 2. The 2nd 10-way unit is not RCD protected and does not have any spare ways.
Is this 80A RCCB 30mA or 100mA?
...30mA
...why the rolleyeyes?
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