Specification for Electrical Upgrade
- All electrical work must be done by a qualified technician.
|Local Electricians are used if certified|
- There must be enough 15Amp(Red) 3-point plugs to accommodate each computer on a separate plug as well as enough for peripherals. A good rule of thumb is to have 1,5 times as many plugs as computers.
- For safety reasons electrical wiring must be in conduit piping below the work surfaces, but Surfix-type cable and wall mounted sockets are also acceptable. Plugs must be mounted against the wall approximately 75mm below the work surface and cables must lead to the plugs through holes in the work surface against the wall at the back. Alternatively the plugs can be mounted approximately 75mm above the work surface.
- To avoid power spikes and dips, the computer lab must be on its own electrical circuit and must be broken into segments each adequate to accommodate the computers and peripherals on that segment. Air conditioners in the computer lab must not share the circuit with the computers.
- Electrical wires to an island worktop in the middle of the room, must preferably be under the floor or must have suitable ducting that will ensure the safety of pupils who have to walk over these cables.
- Neon lights with diffusers are preferable in order to prevent glare or reflections. More than one switch should be fitted to allow partial darkening of the room for overhead projection, especially at the front of the room.
- An electrical certificate of compliance shall be issued to the school on completion of the work. A well ventilated, lockup cabinet will be build in conjunction with the desktops in labs that does not have an additional room for the server.
Installation of electrical connections before tops are secured to brackets
- A sub distribution board, shall be installed in the computer room No: 27.
- The sub distribution board shall be fitted with earth leakage protection.
- A maximum of five wall plug sockets shall be connected to one circuit. Each circuit shall be protected by a 20 amp circuit breaker.
- The server computer, teacher computer and UPS should be on one circuit.
- A minimum 33 plug points are needed, but allow for 38 normal plug points in the room.
- Plug points will be under worktops.
- Electrical wiring will run in conduit tubing under the worktops. Where wiring will run up a wall or where long sections are exposed to viewing, use small square trunking.
- Computer lab will be fitted with a single phase 24,000 BTU air conditioner - window mounted type.
- The air conditioning units shall not be connected to the sub distribution board circuits for computers.
- The window mounted air-conditioner must have metal mesh fitted around it.