Power Failures can be one of the more dangerous faults an Electrician can attend to; as well as for infrastructure of the electrical system.
A short circuit is simply a low resistance connection between the two conductors supplying electrical power to any circuit.
This results in excessive current flow in the power source through the 'short,' and may even cause the power source to be destroyed. The electrical opposite of a short circuit is an "open circuit", which is an infinite resistance between two nodes.
The following situations can cause a power failure:
1. An overload condition : the total load drawn over the circuit in connection can cause the circuit breaker to trip. If the cascading on the circuit hasn't been engineered the Council / Eskom main breaker could of tripped.
2. A Short Circuit, a dangerous condition, which could lead to harm to an individual or to property. A short circuit happens when the phase conductor is in contact with the earth or neutral conductor. This can cause a flash over, excessive heat, and a carbon build up, and a break down in the insulation. In trying to reset the breaker can cause the circuit breaker rupturing and be a very dangerous condition.
3. The main cable is damaged, or compromised. There are cable bending radius that must be following in SANS 10142-1, and if the cable in question is bent too sharply, it can deteriorate rapidly and cause a short circuit.
An electrician, when testing the integrity of the cable, will remove power and appliances from the circuit in question, and use an insulation tester. If the reading is below 1 MOhm the cable has failed.
Our Company can identify the problem, and can fix on site if possible, do a safe temporary repair and then return to install a new system.
Our company is registered to work up to 1000Vac.
Such overheating is a common cause of fires. An electric arc, if it forms during the short circuit, produces high amount of heat and can cause ignition of combustible substances as well.