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Changeover Switches and Generator Connection Explained

The Electricals Ghana Team

  • generators
  • backup-power
  • safety

You have bought a generator to ride out dumsor, and now you want it to run the house — not just a few extension leads snaking through the door. The piece of equipment that makes that safe and proper is a changeover switch. It is the single most important part of any generator connection, and the part people most often try to skip. Here is what it does, why skipping it is genuinely dangerous, and what a proper connection involves in Accra.

The Problem a Changeover Switch Solves

Your house can be fed from two sources: the grid (ECG) and your generator. The one rule that must never be broken is that only one of them is connected to your wiring at a time. If both can feed the house at once, two serious dangers appear:

  1. Backfeed onto the grid. When ECG power is off and your generator is running, if your wiring is also connected to the grid, your generator can push power back down the supply line. That line is what ECG linesmen handle believing it is dead. Backfeed can kill them. It can also destroy your generator the instant ECG power returns.
  2. A clash when the grid returns. If the grid comes back while the generator is still connected, the two supplies collide — damaging equipment and creating a serious fault.

A changeover switch makes both impossible. It physically connects the house to either the grid or the generator — never both. That is its whole job, and it is not optional.

Manual vs Automatic Changeover

There are two kinds, and the right one depends on your situation.

Manual Changeover Switch

You flip the switch by hand: grid off, start the generator, flip to generator; when the grid returns, flip back and shut the generator down. Simple, robust, affordable, and perfectly safe — the most common choice for homes. The trade-off is that you have to be there to switch over.

Automatic Transfer Switch (ATS)

This senses when the grid fails, starts the generator, and transfers the load automatically — then switches back and stops the generator when the grid returns. Convenient and important where an outage cannot be tolerated, but more expensive and more involved to install. Worth it for some homes and many businesses; overkill for others.

We will tell you honestly which one fits your situation rather than selling you the bigger box.

Why “Just Run Some Extension Leads” Is the Wrong Answer

Plugging the house into a generator with a homemade lead — especially the infamous “suicide cord” with a plug on both ends — is one of the most dangerous things you can do with a generator. It energises sockets and the wiring from the wrong end, bypasses your protection, and can backfeed the grid. People are killed doing this every year. A proper changeover connection costs a fraction of what a generator costs, and it is the part that makes the whole investment safe.

What a Proper Generator Connection Involves

A correct installation by a licensed electrician includes:

This is part of getting backup power that actually works — whether your backup is a generator, an inverter system, or both.

What It Costs — Honestly

A changeover switch connection is, indicatively, a labour cost of around GH₵300–600 for a straightforward manual installation, plus the switch and any cabling and the inlet. An automatic transfer switch costs more, both in the device and the install. The final figure depends on your generator size, where it sits relative to the board, and how much cabling the run needs — so we give you a clear price from a quick look before we start, never a number guessed over the phone. A call-out, if you just want it assessed, starts indicatively from around GH₵200.

A Word on Doing It Right Once

A generator is a real investment, and dumsor is not going away. The changeover is the part that decides whether that investment is safe to live with for years or a hazard waiting for the day the grid returns at the wrong moment. Done properly once, by a licensed electrician, it is something you stop thinking about. Done with a homemade lead, it is something that can hurt someone you have never met.

Electricals Ghana installs changeover switches and generator connections across Greater Accra since 1987 — Energy-Commission-licensed, working to L.I. 2008 and GS 1009:2012. Call +233 23 063 0022 and tell us your generator size; we will tell you what your connection needs.