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Charge Codes and Switch Regimes

What is a Charge Code?

A Charge code is a 13 digit number assigned to apparatus that UMS Customers wish to add to their inventories. Charge codes are used within the UMSO systems to calculate volumes of electricity consumed. If you use a piece of equipment, it must go on the inventory with a charge code. The application procedure for a charge code for a new piece of equipment is detailed in the Operational Information document in the table below.

The charge codes in the Unmetered Supplies Operational Information document are no longer contained within a Code Subsidiary Document. No BSCP520 appended documents will be produced.

If the charge code you need is not listed in the document below, please apply for one, as laid out in the testing procedure in the UMS Charge Code Process document.

The UMS Charge Code Application form is located under Related Content. Please download and complete any relevant forms and send it along with your application form to our email address

UMS Charge Code Process [150 Kb]
Version: 4.0

Burn Hours Review: Methodology Statement [315 Kb]
Version: 3.0

Operational Information Document
Version: 17.0

Unmetered Supplies Operational Charge Codes – xls
Version: MDD 255 v1

Unmetered Supplies Operational Charge Codes – csv
Version: MDD 255 v1

Manufacturer Equipment LED Range Spreadsheet – xls
Version: MDD 255 v1

Unmetered Supplies Operational Switch Regimes – xls
Version: MDD 255 v1

Unmetered Supplies Operational Switch Regimes – csv
Version: MDD 255 v1

Variable Power Switch Regime Spreadsheet
Version: MDD 255 v1

Motorway Sign Charge Codes [52 Kb]
Version: 3.1

Non Standard Conversion Charge Codes – xls [67 Kb]
Version: 1.0

UMS Motorway Hours [48 Kb]
Version: 1.0

* If you are downloading a .csv file, please ensure you right click on the link and ‘save target as….’.

Test Procedure

Please note that our requirements for test house accreditation have changed. In the past, we considered ISO9001 accreditation, provided it evidenced the ability to carry out accurate electrical testing of equipment. However, we found it extremely difficult to verify this ability using ISO9001. We now require that any test house used for UMS testing be ISO17025 accredited, with the schedule of accreditation for the test house explicitly detailing the range of wattages (or alternatively, voltages and amps) that the test house is competent to test between. It is extremely important that applicants discuss with us any test house that we have not already approved under these new requirements, in advance of agreeing to use that test house in support of a Charge Code application. A test house that we have not already approved may not be acceptable, which will result in new testing being needed. An indicative list of the accredited test houses that have been used by applicants after the advent of the accreditation change can be found here. If you require further guidance on this, please contact us on the contact details on the right of this page.

ELEXON have identified some cases where additional guidance is needed with regards to the testing process of some products. One case is that of Wi-Fi units which do not produce realistic figures in laboratory testing when the equipment is simply turned on and no data flow is applied. We advise manufacturers to test these units under data flow in a mesh network so that the test results obtained are representative of the unit’s normal operating conditions.

What is a Switch Regime?

A Switch Regime is a three digit numeric/alpha-numeric code for any Unmetered Supply equipment identifying the number of hours that the equipment will be operational. It also details the on/off times of the equipment.

The application procedure for a switch regime is the same as that for charge codes.

Charge Code/Switch Regime Application Schedule

The dates below are deadline dates for all charge code and switch regime applications, as well as the dates all application responses will be sent to applicants. We reserve the right to change these dates if necessary. You must send your applications ahead of the deadline dates to allow adequate time for initial review.

Please be aware that we insist upon ISO17025 accreditation supplied with test data for UMS Charge Codes explicitly referencing the testing of electrical properties in its scope. ELEXON reserves discretion as to what accreditation it will accept, and therefore strongly encourages applicants to discuss potential testing arrangements with ELEXON prior to obtaining test data.

Applications Accepted From* Application Deadline Date Application Response Date Go Live Date
26/08/2016 22/09/2016 02/11/2016 16/11/2016
23/09/2016 27/10/2016 07/12/2016 21/12/2016
28/10/2016 17/11/2016 04/01/2017 18/01/2017
18/11/2016 22/12/2016 01/02/2017 15/02/2017
23/12/2016 19/01/2017 01/03/2017 15/03/2017
20/01/2017 23/02/2017 05/04/2017 19/04/2017
24/02/2017 23/03/2017 03/05/2017 17/05/2017
24/03/2017 20/04/2017 31/05/2017 14/06/2017
21/04/2017 25/05/2017 05/07/2017 19/07/2017
26/05/2017 22/06/2017 02/08/2017 16/08/2017
23/06/2017 27/07/2017 06/09/2017 20/09/2017
28/07/2017 24/08/2017 04/10/2017 18/10/2017

* Applications received earlier in each cycle allow more time for processing and initial reviews to be completed ahead of the deadline date, resulting in a greater likelihood of having a successful application that month.