Solar panel DC cables 400+ VDC

[Dangeroushamster]

Hi,
I have recently had solar panels installed and the electrician has run the DC cables, which have 400+VDC running in them, down the external wall in 20mm conduit.

They have drilled a hole in the back of the end box and run the cables through my cavity wall unprotected. They haven't used fire stop at either end where the cores pass through the wall. When the cables come into the house they have run the cables in mini trunking to the inverter

Shouldn't they have protected these two single cables in conduit <edit> when they come through the cavity

Any advice much appreciated

 

[Monkeh]

They're surface mounted and visible, what makes you think they need extra protection?

 

[Dangeroushamster]

They are surface mounted and protected coming down the wall. However, They then come out of the back of the end box through a cavity wall and are neither secured or protected

Water will ingress into the end box and wall too because both are open to the elements. Surely they shouldn't just go through the wall like this