Distribution Boards are the nerve centre and the most critical part of the Electrical Installation.
RSA Electrical is qualified to install, do maintenance and fault finding on all types of Distribution Boards, from 230Volts to 1000Vac.
A distribution board (DB) is where the electrical supply is distributed from within the building.
The main supply cable comes into the board and is then distributed to the breakers and from there to all the circuits, e.g. lights, plugs. It usually houses all the contact breakers, earth leakage unit and may house items such as a door bell transformer and timers. Various sizes of distribution boards are available.
The main distribution board is usually in the house where the main electrical cable enters and smaller boards, together with contact breakers and possibly earth leakage units are at other points, such as swimming pool pumps, gate motors and outbuildings.
Various types of distribution boards are available; as surface mounted, flush mounted or floor standing; with closing doors or see through plastic covers or doors and in different sizes.
These are determined by the number of circuits rewired within the board to which some manufacturers refer to as modules and others as “way” e.g. 8, 12, 18, 24, 36, etc. way or module.
The interior of the distribution board is pre-fitted with a clip tray or DIN rail for mounting the miniature circuit breakers (MCB) and other devices.
These two different types of MCB’s referred to as “mini rail” or “DIN” which are only interchangeable if special adaptor brackets are used.
While mini rail MCB’s can be slightly narrower than DIN MCB’s thus giving an advantage of fitting more into the same space available the number of accessories on the market for this type of distribution board is limited as many manufacturers are now using the DIN format for their equipment.
With the DIN format, the normal range of earth leakage units, disconnecting switches as well as MCB’s are available.
In addition to this, various types of meters, time switches, pilot lights, surge arresters, etc. are manufactured as well as GSM (Global System for Mobile Communications) units to facilitate remote monitoring and control of events via a cell phone. This now makes the DIN type of distribution board very versatile. Distribution boards can be purchased either as an empty enclosure to enable the contractor to equip it, or as a ready wired standard unit, or as a specially manufactured item to the client’s requirements. Also available are distribution boards for specific applications such as swimming pools, ready boards for low-cost housing, irrigation systems, etc. Each distribution board must be controlled by a switch disconnector (mains or main switch).
Each distribution board must be controlled by a switch disconnector (mains or main switch) The switch disconnector should:
A distribution board must comply with the requirements of SANS 10142, and each item of electrical equipment used in a distribution board should comply with the requirements of this standard: