In order to make best use of the UPS equipment and to ensure maximum protection of the critical load, it is important to carefully consider how best to connect the load components.
Large ring circuits feeding many critical load devices are unsuitable, as a fault on one device may cause the circuit feeding it to trip or fuse and consequently disconnect power to other pieces of important equipment.
Radial wiring with individual devices protected by their own circuit breakers is a far better approach – in this way a fault in one device will cause that device only to be disconnected and remaining critical load elements will remain undisturbed.
To avoid confusion, particular attention must be paid to the labelling of circuit breakers and fuses in the load distribution panels.
Earthing – in any electrical installation, correct earthing is essential for personnel safety and equipment protection. A protected power installation is no exception. It is essential to ensure that all earthing points within the system are connected to a properly planned and secure earthing system.
As a minimum, a properly planned and secure earthing system for a computer and UPS installation must provide:
1. Protection against electrical shock
2. A short, low impedance return path for fault currents
3. A path for induced currents caused by high voltages such as lightning
4. Straightforward connection facilities for future expansion.
Most earthing installations are based on star or grid configurations.
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