Shower 32amp breaker

My tendency would be to ignore it if the run is hard to change... but upgrade if it's easy. My own home has had an 8.5kw shower which runs between 38 and 39 amps  (the standing voltage is about 244-247 usually, due to being next door to the substation). This has been sat on a 32A breaker for 18 yrs, and more recently a B32 RCBO. Because it was 6mm2 I didn't upgrade the OCPD to a B40 when changing to RCBO's. No signs of overheating. along the route or in the connections when i upgraded to the RCBOs in 2018.


We tend to take shortish showers though (10 min MAX). A household with a teenager who likes half hour showers may have alternate experiences.


Ideally I'd upgrade, but not possible with the routing :(


Edit: the final section of the cable is 10mm2 from the isolator to the shower unit because I had the opportunity to do so. The original 6mm was done by an 'electrician' who causes me to use scare quotes round the word.  He bodged TRS (black rubber) cable into 30A jb's and replaced the first 2m from the board to the roofspace (bungalow), while I was resident in the USA and my elderly mother was in charge.


There are words for what I think of him but they're not fit for this forum.

My tendency would be to ignore it if the run is hard to change... but upgrade if it's easy. My own home has had an 8.5kw shower which runs between 38 and 39 amps  (the standing voltage is about 244-247 usually, due to being next door to the substation). This has been sat on a 32A breaker for 18 yrs, and more recently a B32 RCBO. Because it was 6mm2 I didn't upgrade the OCPD to a B40 when changing to RCBO's. No signs of overheating. along the route or in the connections when i upgraded to the RCBOs in 2018.


We tend to take shortish showers though (10 min MAX). A household with a teenager who likes half hour showers may have alternate experiences.


Ideally I'd upgrade, but not possible with the routing :(


Edit: the final section of the cable is 10mm2 from the isolator to the shower unit because I had the opportunity to do so. The original 6mm was done by an 'electrician' who causes me to use scare quotes round the word.  He bodged TRS (black rubber) cable into 30A jb's and replaced the first 2m from the board to the roofspace (bungalow), while I was resident in the USA and my elderly mother was in charge.


There are words for what I think of him but they're not fit for this forum.