An Electric Shower has been fitted - 10.5kW, 10.0mm2 cable, 40A MCB, RCD protected. When the Electric Shower is switched ON the lights dim.
The voltage when the shower is OFF measures 235V. When the shower is turned ON the voltage drops down to 222V. Obviously, more than 4% drop so does not meet regs.
The suppliers fuse is 60/80A. The manual reccomends 80/100A.
The suppliers quoted £370 to upgrade the fuse to 100A + 8/10 week waiting time but will the fuse upgrade fix the problem? Does the cable coming into the house need to upgraded as well? Cant see how upgrading the fuse will fix the problem..... Help appreciated.
The voltage when the shower is OFF measures 235V. When the shower is turned ON the voltage drops down to 222V. Obviously, more than 4% drop so does not meet regs.
The suppliers fuse is 60/80A. The manual reccomends 80/100A.
The suppliers quoted £370 to upgrade the fuse to 100A + 8/10 week waiting time but will the fuse upgrade fix the problem? Does the cable coming into the house need to upgraded as well? Cant see how upgrading the fuse will fix the problem..... Help appreciated.