mtt.tr
Member
- Messages
- 8,428
- Location
- Essex/Suffolk border
Due no doubt to the **** poor terminations in the MCB's and the use of plated steel screws instead of brass. Properly tightened brass screws do not come lose! We were trained to tighten till the brass squeaked, I have had MCB screws shear off before the same torque was achieved. How about another reg to put all the wago type connectors in fireproof enclosures? Another side to the problem is the amount of chinese counterfiet electrical gear that is about, and is being sold (unknowingly) through wholesaler networks! The problem was allowed for under the old IEE regulations which said " No circuit breaker or other mechanical device shall be fitted to any final sub circuit as a SOLE means of protection" In other words, all circuit breakers must be backed up with a fuse to prevent overcurrent. Fuses fail safe, MCB's and the like DO NOT!
Mcbs have multiple methods of tripping and dont rely on one method.