Technology

Earthing & Bonding
Design & Installation Featured Technology
An introduction to earthing and bonding
Earthing and bonding are two very different, but often confused, methods of preventing electric shock. The principal of earthing is to limit the duration of touch voltages if you were to make contact with an exposed conductive part. The earth creates a safe route for the current to flow instead of causing electric shock. The purpose of bonding is to reduce the risk of electric shock if you find yourself…
Cable Management
Design & Installation Technology
An overview of cable management systems
There are a wide variety of containment systems available to organise and store cables within an installation. They tend not to be used exclusively for a particular type of wiring system, and the containment system chosen is often as much decided by the budget and practical considerations of the building it is being installed in as the cabling type itself. Fixings in cable management With such a range of cable…
Technology Uncategorized
How do you select the right MCB or RCBO?
Technology continues to evolve in the field of low-voltage power distribution and protection. 30 years ago the installer was typically faced with the decision on what size fuse wire to use. Now they must consider which MCB or RCBO to install, with even more choice than ever on what levels of protection against the effects of electrical fault to afford. Released in 2018, BS 7671: Requirements for Electrical Installations (IET…
ABB MCB
Science Technology
How does an MCB work?
This excerpt from ABB introduces the technology inside and miniature circuit breaker (MCB). What does an MCB do? The short answer: it protects wires from overloads and short-circuits. When we look on the inside of an MCB we can see how that actually works. For overload protection the temperature of a bimetal, through which the current passes (yellow area), is decisive. If the nominal current—the current the circuit breaker is…
Example of unfused spur
Design & Installation Technology
Connecting equipment to a socket-outlet circuit
This article provides guidance on how to connect items of equipment to socket-outlet circuits. Socket-outlets are typically supplied by either a ring or a radial final circuit. In either case, a number of items of permanently connected equipment may also be supplied by the circuit. Such equipment should preferably be of a rating not exceeding 2 kW. The choices available to the electrician for connecting items of equipment to socket-outlet…
Schneider circuit protection
Design & Installation Featured Technology
What is circuit protection?
Circuit protection, at its simplest, is the intentional addition of a ‘weak link’ in an electrical circuit. This link will be broken in the event of a fault – whether that’s high temperature, excessive current or a short circuit in a conductor, thus protecting the electrical circuit it’s part of from damage. Why are circuit protective devices important? Protective devices are important because they ensure that under fault conditions, a…