Training Yard Unit

Energized High Voltage Training, Without the Risk

A Training Yard safety system designed by Linemen, for Linemen.

In order to survive in the field and/or reduce risks linemen must be able to think critically & clearly, and solve problems quickly under extreme stress. This can be difficult, so training instructors should do live energized training drills, to give students the opportunity to develop these skills. The overall goal of this behavioral training is to heighten awareness and instill good habits in students through repeated exposure to real-world situations they will find themselves in.

The Timpson Training Yard Panel is a state-of-the-art system that allows line workers to train using the same real-world voltage that they will see every day on the job, while at the same time keeping the current to a safe, non-lethal level. Whether you are learning skills for the first time, or are a trainer that sees the benefits of training your crew safely with full voltage, we can customize your training yard control system, for your yard.

The base model can safely energize one circuit in your training yard, while more advanced models can energize up to nine circuits. Have a yard that has more than nine circuits? Contact Timpson directly to have us build a custom plan to suit your yard exclusively.

What’s New?

Our Training Yard Panels can now be accompanied by our Operator Workstation computer, which can be used to monitor trainee test time, record the number of shorts, keep historical track of test records via trainee ID number, monitor the yard from within the training office, and more.

Click to download 814: Trainer Workstation Computer Selection Guide

Product Selection
Select your specifications to determine your Product Code.


Product Code:   

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Incoming Voltage:

Incoming Supply Phase:

Yard Voltage (Line to Ground):

Quantity of Isolated Circuits:

HMI Touchscreen:


Processor scan times:

  • Average Scan Time: 1-2 ms/program cycle

Safety Relay Info:

  • SIL 3
  • Release Time: t

Mean Time to Open Upon Detected Fault:

  • t<20ms

Safety Ratings:

  • Fail Safe I/O: SIL Level 3 (per IEC 61508);
  • Safety Relay (Master) SIL Level 3 (per IEC 62061);
  • SIL Level 3 as above;

Safety Integrity Level (SIL) Info:

  • Probability of Failure per Hour:
  • SIL Level 3: 0.000 000 1 – 0.000 000 01 (10-7-10-8);

International Electro-technical Commission (IEC) Standards Info:

  • IEC 61508 – Electrical Safety of Electrical/Electronic/Programmable safety related systems;
  • IEC 62061 – Safety for Machinery

Current Transducer & Analog Input Incremental Resolution:

  • 0.00001A (10µA) Increments

Misc. Safety Info:

  • Main Disconnect Handle allows (3) simultaneous Lock-Out-Tag-Out systems;
  • System reset and initialization requires a supervisory key;
  • High-Voltage Energize pushbutton is protected under a pad-lockable safety cover;
  • System Safe/Off pushbutton utilizes redundant normally closed contacts, one of which is Normally Closed Self-Monitoring;
  • E-Stop Pushbuttons utilize SIL3 redundant sets of normally closed contacts, one of which is Normally Closed Self-Monitoring;
  • Master Safety relay can only be reset by inserting the supervisory key and indexing the RESET selector switch to the Safety position – the controller cannot reset the safety relay via program. (The master safety relay must be reset once power is applied to the panel before operation can commence.);
  • Panel doors have coded magnetic door switch with SIL3 redundant N.C. contacts in line with the master safety relay;
  • High-Voltage is physically isolated inside control panel from low voltage.


  • UL 508A Industrial Control Panel

Programs & Tech Notes

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Bulletin Number Descriptor
1 805 Product Selection Guide
2 805A Accessory Selection Guide
3 805B Recommended Spare Parts Selection Guide
4 814 Trainer Workstation Computer Selection Guide
5 1100 User Manual
6 2300 Installation Manual
7 3711 Installation Check-List
8 4408 Start-Up & Commissioning Check-List


Q: What is the current set-point within the monitoring circuit?

  • A: While that exact number is training yard specific, the base-rate is between 1 to 1.5mA of current, as calculated on the High-Voltage side.

Q: What is the let-through current after the system detects a fault?

  • A: Testing in our lab consistently returned let through currents of less than 20mA.

Q: After a fault is detected, how much time passes before the line is de-energized?

  • A: Testing in our lab shows a mean-time to open in 59ms.

Q: Will Timpson install the system in our training yard?

  • A: Unfortunately no, Timpson does not possess the capabilities to install our systems throughout the country and/or globally. We can however, work to answer any questions that your installation contactor may have. We also have Bulletin 2300 – Training Yard Installation Manual available for download on our website.

Q: Can Timpson provide us with info on the concrete pad/slab requirements?

  • A: Timpson cannot provide these requirements as local codes and soil constraints differ from location to location.

Q: What is the environmental rating of the panel?

  • A: All Training Yard systems are constructed to meet Nema 4 (IP66) requirements. However, some environments will require additional consideration from the Timpson engineers. For instance, extreme heat with temperatures over 104*F for more than a week at a time, and extreme cold with risk of ice build-up, must be brought to our attention prior to ordering.

Q: What is the system capable of energizing in my yard?

  • A: The system is capable of energizing the lines, and secondary transformers – without load. Basically, only the excitation current of transformers will be recognized at start-up and allowed to become energized. The system is only capable of outputting 30mA of total line current, as a secondary means of safety.

Timpson Electrical & Aerial Services, LLC
PO Box 948
Rising Sun, MD 21911