Common use of Load Customer’s System Design and Protection Requirements Clause in Contracts

Load Customer’s System Design and Protection Requirements. The Customer shall ensure that its electrical system design meets Horizon Utilities‟ design requirements for the particular voltage at which it is to be connected to the Distribution System. The Customer shall consider these and other requirements mentioned in Section 1 of this Schedule in the design, installation, operation and maintenance of Customer Equipment. The Customer is responsible for designing, installing, maintaining and protecting Customer Equipment against all internal electrical faults (in Customer Equipment) and other external conditions imposed by the Distribution System such as over voltages, voltage unbalances, open phase(s) and re-closings of the feeder breaker or re-closer. The Customer shall take reasonable steps to ensure that the operation or failure of Customer Equipment does not cause an outage or disturbance to the Distribution System. To this end, the Customer shall ensure that the application and settings of protective device(s) at the operational Demarcation Point are properly chosen and that the devices are duly coordinated. The complexity of the protection used at an interface point will vary depending upon the voltage level, system configuration, the type and amount of Customer load. Some large Customers may be supplied from more than one feeder. These feeders may have different fault levels and originate from different distribution or transformer stations or transformers within the same distribution or transformer station. The protection scheme and protection coordination shall account for these possibilities. The protective device(s), at the interface point should: i) have suitable ratings, characteristics and setting ranges so that proper coordination with the upstream feeder protective devices is achieved; and ii) be designed and selected so as to provide the required safety, selectivity, reliability and speed of operation; and iii) protect the downstream equipment, such as transformer, bus bar, etc., against faults and other abnormal conditions; and iv) provide backup protection for the downstream equipment protective devices.