At work in our main kitchen, the 6kW (26A sp) water packed up. The restaurant staff were in turmoil, as they had no hot water to make the tea. Luckily we had a new spare one lying around.
The old one was fed by a 32A supply, 4mm 6242B (LSOH) cable 32A RCBO. From the rotary isolator, the appliance was fed by a 3 core 4mm H07RN-F cable (about 1m). So I was just going to disconnect that from the old appliance, and reconnect to the new one.
However, once I disconnected it, I found the insulation on the cores had failed, it was crumbling away in places. The sheath was fine. The stranded conductors were slightly rigid. As the flex was too short to cut back, we got a new piece. No ferrules had been used on the terminations, but there was no sign of thermal damage on the terminals.
When I removed the old flex, it was pretty much the same throughout its length. No obvious sign of similar damage to the 6242B cable. I see that the 4mm H07RN-F cable is rated at 30-34A, depending on manufacturers.
So I can’t see the flex is being overloaded, terminals could of been a bit tighter.
No pic of cable I’m afraid. Thoughts?
The old one was fed by a 32A supply, 4mm 6242B (LSOH) cable 32A RCBO. From the rotary isolator, the appliance was fed by a 3 core 4mm H07RN-F cable (about 1m). So I was just going to disconnect that from the old appliance, and reconnect to the new one.
However, once I disconnected it, I found the insulation on the cores had failed, it was crumbling away in places. The sheath was fine. The stranded conductors were slightly rigid. As the flex was too short to cut back, we got a new piece. No ferrules had been used on the terminations, but there was no sign of thermal damage on the terminals.
When I removed the old flex, it was pretty much the same throughout its length. No obvious sign of similar damage to the 6242B cable. I see that the 4mm H07RN-F cable is rated at 30-34A, depending on manufacturers.
So I can’t see the flex is being overloaded, terminals could of been a bit tighter.
No pic of cable I’m afraid. Thoughts?