This made my eyebrows go up!

[Tony S]

To be fair I find showers with two often take longer :slap

Last time I had to get the hotel manager to repair the shower cubical. He didn’t ask, he just added it to the bill.

 

[Evans Electric]

No comment. 

 

[Rob_the_rich]

thank-you for reply, its a interesting topic.

i went to a job the other week where a customers house main fuse had blown ( 60amp ) there was a none RCD board in at the time but the MCB did not trip.

he said the hob rings went bright red then everything just went bang. is this due to the cable over exceeding its rating causing the main fuse to blow ?

Fuses and MCBs have different characteristics, the fuse could be more likely to blow first at higher fault currents irrespective of the rating of the MCB, google discrimination between fuses and MCBs.

Reading your example again;

say two people are showering at the same time in a 10.8kw shower 10800 x 2 = 21600 divided by 240 = 90 amp

plus say mother or the father is also cooking the tea or doing some DIY jobs in the workshop 10.8 plus 4.6kw = 15400 divided by 240 = 64 amp 

bringing a total of 154 amp ?

We divide by 230V nowadays, not 240.

 

[Rob_the_rich]

Last time I had to get the hotel manager to repair the shower cubical. He didn’t ask, he just added it to the bill.

To get back on topic, this made my eyebrows go up.

 

[Andy™]

We divide by 230V nowadays, not 240.

showers are almost always still rated at 240v, with a lower power rating at 230v