ats wiring diagram
This is a free printable ats wiring diagram: download the diagram as SVG or open it and print to paper or PDF.
Diagram checks and scope
- Components
- 7
- Wired connections
- 8
- Automated check
- Automated pin, route, source, and topology checks passed; this is not a safety certification.
A Ats Wiring Diagram wiring diagram provides comprehensive guidance for electrical installation and troubleshooting in automotive and industrial applications. This specialized diagram illustrates the proper connections, wire gauges, component placement, and safety procedures required for correct system operation. Understanding this wiring is essential for technicians, electricians, and professionals working with electrical systems. The diagram shows all connections with color coding, amperage ratings, and grounding requirements to ensure safe and reliable operation. Proper installation following this diagram prevents electrical hazards, system failures, and compliance issues. The schematic includes detailed information about terminals, connections, and circuit protection measures. Professional implementation of this diagram ensures optimal system performance, equipment longevity, and electrical safety for all users and equipment.
How to wire ats wiring diagram
- Calculate load requirements List all loads the ATS will switch, sum their running currents, and add 25%. This determines the ATS current rating. Never size an ATS to the generator rating alone — the load determines the spec.
- Isolate both sources De-energise the mains supply at the distribution board and ensure the generator is off and cannot start. Lock out both sources before any wiring work — ATS panels have two live sources that can both be live simultaneously if not properly isolated.
- Install and mount ATS panel Mount the ATS panel within 3 metres of the main distribution board where possible. The shorter the cable run between ATS output and DB input, the lower the volt drop and the simpler the installation.
- Terminate mains incoming Run the mains supply through MCB1 into the ATS Source 1 terminals (L1, L2, L3, N). Use correctly rated cable lugs and tighten to manufacturer torque specifications.
- Terminate generator incoming Run the generator output through MCB2 into the ATS Source 2 terminals. Keep generator cables physically separate from mains cables within the panel to prevent accidental cross-connection.
- Wire control circuit Connect the 6-core shielded control cable between the ATS controller and the generator control panel. Typically this carries: start/stop, generator ready signal, and mains voltage monitoring. Follow the ATS manufacturer's wiring diagram precisely.
- Set time delays Programme the mains fail delay (typically 5–10 seconds), the generator stabilisation delay (typically 10–15 seconds), and the mains return delay (typically 30 seconds). Document all settings on the ATS panel door label.
- Commission and test With an electrician present, simulate mains failure by opening MCB1. Verify the generator starts automatically, stabilises, and the ATS transfers. Measure voltage and phase sequence at ATS output before switching live loads.
Frequently asked questions
What does an ATS do during load shedding?
When mains voltage drops or disappears, the ATS detects the loss, sends a start signal to the generator, waits for stable generator output, then transfers the load automatically. When mains returns, it transfers back and sends a generator stop signal after a cooldown delay.
Can I wire an ATS myself?
In South Africa, any electrical work on a fixed installation must be done by a registered electrician and a Certificate of Compliance (CoC) issued. Doing this yourself without registration is illegal and invalidates your insurance in the event of a fire or incident.
What is the transfer time delay and why does it matter?
The delay (typically 5–30 seconds) prevents the ATS from transferring during brief mains dips or switching transients. Too short a delay causes unnecessary generator starts; too long leaves the load without power for longer than necessary during an actual outage.
Why must the neutral be switched in an ATS?
Switching the neutral ensures complete isolation from the mains source when on generator. Without neutral switching, a fault on the mains neutral can back-feed through the ATS neutral into a supposedly isolated generator circuit — a serious electrocution hazard.
What size ATS do I need for my home?
Add up the running wattage of all loads you want to back up, convert to amps (watts ÷ 230 for single-phase), and add 25% safety margin. A typical 3-bedroom home with essential loads runs between 40A and 63A single-phase.
Sources and verification
Review status: Not independently reviewed. Automated topology checks confirm stored terminals and routes, not the correctness of manufacturer pin assignments, ratings, regional codes, or installation decisions. Verify those claims against the current primary documentation before use.
- IEC 61082-1:2014 — Rules for electrotechnical documents — International Electrotechnical Commission. Supports: General diagram, drawing, table, and reference-designation presentation conventions. Checked 2026-07-15.