The Unmetered Supply (UMS) Charge Code Process
A charge code is used to look up the circuit watts associated with unmetered equipment to calculate consumption. You can use charge codes to get your equipment connected and to make your billing arrangements.
All UMS equipment must be tested against the criteria set out in BSCP520
. Upon a successful review of the test results, the Supplier Volume Allocation
Group (SVG) issues the manufacturer with a Charge Code
. The review process occurs in two stages. The first stage is internal Elexon review of the application, and the second is expert group review, through the Unmetered Supplies User Group (UMSUG).
The Operational Information Document
(OID) contains detailed information on how to apply for a charge code and the pre-requisites for testing the proposed equipment. All test records are recorded and sent to us for validation. The test data is evaluated and a charge code will be issued to you based on the results. The UMS testing procedure below provides you with guidance on testing.
Why do I test my equipment?
The aim of testing is to provide an accurate indication of the load at the Distribution Network terminals for the particular equipment under normal service conditions; i.e. to establish what consumption would be recorded by a standard meter fitted at the supply terminals. The load tests for equipment designed for operation at other voltages MUST include an appropriate transformer. Brief details of the equipment, including the product name and product code used by the manufacturer, must be supplied with the test data to enable the list of agreed ratings to be maintained.
How do I test my equipment?
Testing needs to be carried out by an ISO 17025 accredited test house or any other test house agreed by Elexon. Accredited test houses which have been used in the past are listed below, although please note that this is not a complete list.
Test Houses for Charge Code Applications
To be issued with a charge code, the circuit watts and Volt Ampere (VA) should be measured at five different voltage levels from 210V, increasing in 10V increments up to 250V (at 50Hz). A sample size of five is recommended.
Brief details of the equipment, including the product name and product code used by the manufacturer, must be supplied with the test data to enable the list of agreed ratings to be maintained.
1. We reserve the right to witness the tests if required.
2. Both power/voltage and volt-ampere/voltage curves will be required with measurements taken at 210, 220, 230 240 and 250 volts, 50 hertz.
3. The accuracy of the measurements shall be stated and the minimum accuracy shall be ±2% of the recorded value.
4. The power measurements must include any voltage transformers necessary to operate the equipment from the mains.
5. The sample size shall be 1% of the expected first year’s production subject to a minimum of five and a maximum of fifty.
6. Samples must be tested after operating for sufficient time to reach their steady load state. If it is likely that the load will vary over the life of the equipment, then testing should be carried out after at least 100 hours of operation.
7. If the equipment contains both lamps and control gear, the control gear will be divided into at least three batches. Each batch will be tested with lamps supplied by a different major manufacturer.
8. If the equipment includes facilities to dim to a fixed load level, then full load as well as dimmed load data is required.
Please note: It is a standard requirement of Unmetered Connection Agreements that the power factor of connected equipment should be as near to unity as practicable, but in any case at not less than 0.85 lagging or 0.95 leading. If equipment does not meet this standard then Distribution Companies may refuse to connect the equipment.
The issue of a charge code does not mean that the equipment meets the requirements of Distribution Companies for an Unmetered Connection.
Intellectual Property Rights, Copyright and Disclaimer
The copyright and other intellectual property rights in this document are vested in Elexon or appear with the consent of the copyright owner. These materials are made available for you for the purposes of your participation in the electricity industry. If you have an interest in the electricity industry, you may view, download, copy, distribute, modify, transmit, publish, sell or create derivative works (in whatever format) from this document or in other cases use for personal academic or other non-commercial purposes. All copyright and other proprietary notices contained in the document must be retained on any copy you make.
All other rights of the copyright owner not expressly dealt with above are reserved.
No representation, warranty or guarantee is made that the information in this document is accurate or complete. While care is taken in the collection and provision of this information, Elexon Limited shall not be liable for any errors, omissions, misstatements or mistakes in any information or damages resulting from the use of this information or action taken in reliance on it.