Release Notes: Trimble Electrical Designer
Welcome to the Trimble Electrical Designer Release Notes page. Here's what's new in ProDesign, Protect, SingleCable and PowerNet.
This page summarises the latest improvements, bug fixes and new features that are included
in the latest version of the Trimble Electrical Designer Suite of products incorporating ProDesign,
ProDesign 3D, Protect, SingleCable and PowerNet.
Do you have an idea how to make Trimble Electrical Designer better? Join us in shaping the future of our products by visiting the TED Idea & Suggestions portal to vote and submit your innovative ideas!
General Updates:
- Microsoft ended support for Windows 10 on 14 October 2025. To maintain the security of your system and ensure uninterrupted compatibility with Trimble Electrical Designer, we strongly recommend all users migrate to Windows 11.
ProDesign v22.0.51
This release incorporates a number of behind-the-scenes performance, reliability and security improvements besides the following feature improvement. For more information on ProDesign, please go to
https://mep.trimble.com/en GB/products/prodesign
Improvements
- ProDesign now supports BS 7671:2018+A4:2026 (Amendment 4).
From 15 October 2026, Amendment 3 will be withdrawn, leaving Amendment 4 as the sole recognized standard for low-voltage electrical design, installation, inspection, and certification in the UK. With this release, you can apply BS 7671:2018+A4:2026 on UK projects before that date.
*Review RCD, AFDD and lighting-column settings when you move a project to Amendment 4
You can create, calculate and report UK projects against Amendment 4, including:
- Project settings, supply voltage tabs, reports and export now reference BS 7671:2018+A4:2026.
- For socket-outlets up to 32 A, the RCD exemption checkbox now reads *Sockets 411.3.3 (b) -RCD omitted by Documented BA5 Risk Assessment*, and AFDD wording uses *High rise residential buildings (HRRBs)* (Regulation 421.1.7).
*Updated socket-outlet RCD exemption and HRRB wording.
- Concealed-cable references now point to Table 52.1 (522.6.202). Buried installation methods are split into D1 (in ducting in the ground) and D2 (direct in the ground).
- Amendment 4 calculation checks now cover RCD type combinations (Figure A53.2), Type-S selectivity (downstream RCD must disconnect all live conductors including the neutral), and 30 mA RCD protection or a recorded exemption for outdoor lighting columns.
- Where a PV inverter feeds a board, ProDesign checks the board rating so the assembly is not thermally overloaded (Regulation 551.7.2.2). Protective devices upstream of generation must be bidirectional (Regulation 530.3.201).
*Select a bidirectional device on circuits upstream of generation.
- For single-phase Mode 3 EV charging points up to 32 A, you can set AFDD location/exemption (Regulation 722.421.1.7.201) and RDC-DD / RDC-PD protection (Regulation 722.531.3.101).
For more detail, open Help Topics from the Home tab, or see the ProDesign User Guide (v22.0.51): Protection (page 141), Lighting Columns (page 193), Inverter (page 198), Project Settings (page 264) and Selectivity Check (page 338).
Resolved Bugs
- [MEPEL-12128] Resolved a bug where a surge protection device (SPD) could not be connected directly to an SPN distribution board, and the software reported that no ways were available.
- [MEPEL-12906] Resolved a bug where Display Results showed a Board Rating of 1 A and a Board Fault Rating of 1 kA for a new distribution board before those values were set in DB Details. Unconfigured ratings now show as N/A or –.
- [MEPEL-12910] [MEPEL-12938] [MEPEL-12949] [MEPEL-12963] Resolved a bug where DC reports showed incorrect or inconsistent fault-current values and labels.
ProDesign 3D
This release incorporates a number of behind-the-scenes performance, reliability and security
improvements.
To download ProDesign 3D, ensure you have a TED 2D Pro+ license and visit the Trimble Downloads.
Improvements:
- ProDesign 3D now supports BS 7671:2018+A4:2026, including the Amendment 4 RCD, AFDD, EV and bidirectional-device checks described under ProDesign.
SingleCable
This release incorporates a number of behind-the-scenes performance, reliability and security improvements.
For more information on SingleCable, please go to
https://mep.trimble.com/en-GB/products/singlecable
Improvements:
- SingleCable now supports BS 7671:2018+A4:2026, including updated regulation references, Amendment 4 templates and EV AFDD / RDC-DD settings.
Protect
This release incorporates a number of behind-the-scenes performance, reliability and security improvements besides the following feature improvement.
For more information on Protect, please go to
https://mep.trimble.com/en-GB/products/protect
Improvements:
- Protect now includes Amendment 4 templates so you can start a BS 7671:2018+A4:2026 study.
PowerNet
This release incorporates a number of behind-the-scenes performance, reliability and security
improvements.
For more information on PowerNet, please go to
https://mep.trimble.com/en-GB/products/powernet
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For older versions check below:
Upgrade procedure
In order to upgrade your software to this new version, you need a Trimble ID. The ProDesign suite of applications will notify you when an application update is available for User Licence. For further support, please see the following Technical Assistance section.
Software Update Notifications
The ProDesign suite of applications will notify you when an application update is available for download.
In case your software has received any calculation updates, you will be notified with a “Calculation Service Version Update'' during the first instance of calculation.
In case your software has received any calculation updates, you will be notified with a “Calculation Service Version Update'' during the first instance of calculation.
Named User Licensing
All products within the Trimble Electrical Designer Suite (ProDesign, Protect, SingleCable and PowerNet) are now powered through named user licensing. This means that users have dedicate licences assigned to their own Trimble ID and ensures everyone uses the same, up-to-date calculations and content. This empowers you to significantly reduce the risk of design discrepancies that occur when different versions of the software are used within your team.
To learn more about this and moving to a Trimble Electrical Designer subscription, call our sales team on 01908 608833 (opt 2). If you have any questions regarding the licence management and accessing the product, please contact our support team via the details below.
Technical Assistance
Our Technical Support team uses a support tool which allows them to view and control users’ machines remotely. This is only ever undertaken with the user’s permission – and while being supervised by the user.
Our applications have a menu option link to the support web page containing details of this assistance should it be required. For more information, please contact our support team via Amtech Support@Trimble.com or call +44 (0)1908 608833 and then choose Option 1.
Customer Portal
If you are a registered customer, please login to the Trimble downloads for downloading the software and to access other related information. If you are not registered yet, please contact our support team as mentioned in the Technical Assistance section.
mep.trimble.com/en-gb/
Trimble MEP makes Building Information Models (BIM) a reality by delivering solutions that transform disconnected workflows between stakeholders into a coordinated, constructible and actionable building model. To ensure a building is constructed in the most efficient way, the Trimble Constructible Process goes beyond BIM by creating models that use actual manufacturer content, allow for prefabrication and full clash detection, connect stakeholders to coordinate in real-time and bring the model directly from the computer to the field. This process optimizes the entire design, build and operate lifecycle.