Voltage & Plug Standards by Country: Wiring an Imported Container Home

HG Prefab foldable expandable container homes — factory-wired, shipped worldwide, configured for your local supply.

Electricity is the one part of an imported building that cannot be universal. A folding container home leaves our factory in Henan as a finished, tested structure with a complete internal installation: cable runs inside the wall panels, a consumer unit, lighting, sockets, an earth system and, where specified, the circuits for a water heater, air conditioner and kitchen. What it cannot leave as is a building equally legal and equally convenient in Texas, Tuscany and Tasmania, because those three places do not agree on voltage, frequency, plug shape or the device that protects the circuit. That is not a defect in the product; it is simply the reality of a world that standardised late and standardised locally.

The gap between what we build and what your local inspector wants is small, and cheapest to close before production rather than after delivery. This guide covers how the unit is wired by default, which voltage and frequency your country uses, which plug types belong to which region, what a licensed electrician changes on site, and how to order the right configuration. For sizing the system itself, start with our container home electrical load guide; for the water and waste side of the same service run, see the plumbing and electrical planning guide.

How Factory Wiring Ships by Default

Every HG Prefab folding unit is wired indoors by electricians who build the same layouts repeatedly, and every unit is continuity-tested, insulation-resistance-tested and functionally tested before it is folded and loaded. That repetition is the point of factory construction: the cable routes, junction boxes and panel layout are identical in the hundredth unit to the first.

Dual-voltage fixtures

The fixtures that travel well are the ones that do not care where they land. Almost all of the lighting in a modern unit is LED, and LED drivers are routinely manufactured with a wide input range that covers both the 110V and the 220V worlds at either frequency. Switch-mode power supplies in phones, laptops, routers, televisions and most small kitchen appliances behave the same way. Practically speaking, the lighting circuit, the socket circuit and the low-voltage control side of your unit are already voltage-agnostic when they ship; the input range printed on the driver is the proof. Where a fixture is not agnostic, we flag it on the specification sheet. Resistive heating elements, compressor-driven equipment and single-voltage motors always need a decision, and all three are covered below.

A panel ready for conversion

The consumer unit, or distribution board, is deliberately specified so that it is a starting point rather than a finished answer. In practice that means:

• Generous spare ways. The board ships with unused positions, so adding a circuit for a local appliance does not mean replacing the enclosure.
• Standard DIN rail geometry. The protective devices mount on the same rail dimension used internationally, so a local breaker of the correct type can be fitted into the existing board.
• Documented circuit schedule. Every way on the board is labelled, and the same schedule appears on the wiring diagram that ships with the unit.
• Accessible termination. The incoming supply termination and the earth bar are laid out so that an electrician can re-terminate without dismantling the interior finishes.

Two configurations are available at order. A region-configured unit ships with socket types, protective devices and voltage rating appropriate for your country. A blank-panel unit ships with complete cable infrastructure and enclosure but leaves the final devices to your electrician — the route most North American buyers take, because it puts a locally certified device into a locally certified installation.

World Voltage Map: 110–127V vs 220–240V, 50 vs 60 Hz

The world splits into two voltage families and two frequency families, and the splits do not line up neatly. North America sits at the low-voltage, high-frequency corner; Europe, most of Asia, Africa and Oceania sit at the high-voltage, low-frequency corner; Japan and Brazil sit in between, with regional variation inside their own borders.

Treat that table as a starting point, not the final word on your address. Several countries run two voltages on different sides of the same street: parts of Brazil are 127V and parts are 220V, and a unit wired for the wrong one needs real work to correct. Tell us the city, not just the country.

Why the split matters for your unit

Voltage determines the rating of every protective device, socket and fixed appliance in the building. Frequency determines whether motors and compressors run at their designed speed. A 220V 50 Hz unit connected to a 110V supply does not usually fail dramatically; it underperforms, and heating elements deliver a fraction of the intended output. A 110V appliance connected to a 220V supply fails immediately. Both outcomes are avoidable with one email before production.

Plug and Socket Types by Region

Plug types are the most visible difference and, conveniently, the easiest to specify. They are lettered in the widely used A-to-N convention, and the letter tells you the pin geometry, the current rating and whether the socket is earthed.

Earthing and polarity

The letter of the plug matters less than what sits behind it. An earthed socket is only earthed if the installation has a real earth path, and how that path is provided differs: some markets earth at the transformer, some at the property, some expect a local electrode. A folding unit arriving as a standalone building needs the electrode and bonding decided on site by someone who knows the local supply. Polarity matters too — reversing line and neutral will not stop a lamp working, but it leaves a single-pole switch disconnecting the wrong conductor, which is exactly what an inspector looks for.

Converting the Panel: What an Electrician Changes

Buyers often imagine the conversion as a large job. In a unit that was configured correctly at the factory, it is not. The work concentrates on three things.

Breakers and protection devices

Protective devices are specified for a voltage and a breaking capacity, and certified for a market. A device rated for 230V service cannot simply be left on a 120V supply, and a device without local certification will not pass inspection even if its ratings are adequate. The electrician swaps the devices in the existing enclosure for locally certified equivalents, confirms breaking capacity against the available fault current, and matches the residual current protection to local rules — North America leans on GFCI and AFCI at circuit level, much of Europe on one or more RCDs at the board. The enclosure, rail and cable infrastructure stay as built.

Receptacles and switches

Socket outlets and switch plates are mechanical items on a standard back box, so swapping them is quick. What takes longer is confirming that the number and spacing of outlets matches the local code for the room — kitchen worktop spacing and dedicated small-appliance circuits vary by market — and adding any outlet the code requires that the factory layout did not include. This is where the spare ways in the board earn their keep.

Water heater and heat pump elements

This is the part that cannot be resolved with a screwdriver. A resistive water heater element is a fixed resistance: feed it half the design voltage and it delivers roughly a quarter of its rated power, which in practice means water that never reaches temperature. Heat pump and air conditioner compressors are worse, because they also care about frequency. Specify the element or appliance for the destination voltage at the factory, or buy it locally and have the factory terminate the circuit, isolator and cable size only. We do both routinely and will tell you which is cheaper for your country.

Induction hobs, ovens, electric showers and clothes dryers belong in the same category. If it makes heat or turns a motor, it needs a voltage decision before the walls close.

Ordering the Right Configuration at the Factory

Configuration is free at the point of order and expensive afterwards, because the expensive part is not the socket but opening a finished wall to reach the cable behind it. Send us four things:

• Country and city. Voltage and frequency follow the city in markets with internal variation.
• Nominal supply and service size. What the utility will actually deliver, in amps, and whether it is single-phase or three-phase.
• Socket and switch preference. The letter type, or "blank panel, local devices".
• Fixed appliances. Water heater, air conditioning, hob, oven — either factory-supplied at the correct voltage, or local supply with the circuit pre-wired.

HG Prefab factory prices for the folding unit itself are 20FT $7,200–$9,800; 30FT $10,500–$14,500; 40FT $12,500–$16,500, ex-works, before freight, taxes and local compliance. Regional electrical configuration is included in the specification rather than priced as an extra, so the only real choice is whether the devices are fitted in China or at home. Most buyers outside North America take the factory-fitted option; North American buyers usually take the blank-panel route and let a local electrician finish it — see our US import guide and Europe import guide for how that interacts with certification in each market.

On-Site Hookup and Local Code

The unit arrives with a complete internal installation and a defined point of connection. Everything after that point is local work, and in almost every jurisdiction it is work that must be done by a licensed electrician and then inspected. Sequence it as follows.

• Before delivery: apply for the utility service and the electrical permit. Both are slower than the shipping, and the service application is the one most likely to delay occupancy.
• On the day: Yes — a crane or forklift is required to offload the folded unit from the truck. Once it is set in position, four workers can unfold and assemble the main structure in about 2 hours.
• Same day or next: the electrician terminates the supply, fits or verifies the protective devices, completes earthing and bonding, and tests every circuit.
• Before occupancy: inspection and certification by the local authority or an accredited body, using the wiring diagram and panel schedule that ship with the unit.

Two practical points that save a return visit. Confirm the service size before ordering: an undersized service means a utility upgrade, and utility upgrades are measured in months. And keep the panel schedule — the inspector will ask what each way feeds, and the answer is printed on the document that ships with the unit.

Off-Grid Inverters and Frequency

A growing share of folding units never connect to a grid at all, and off-grid changes the question from "which country" to "which inverter". An inverter produces whatever voltage and frequency it is built to produce, so a solar-and-battery system can be specified as 230V 50 Hz or 120V 60 Hz without any of the conversion work above. Three things still matter.

• Frequency stability. Pure sine wave output at a stable frequency is what motors and compressors need; modified sine wave inverters are not the right choice for a dwelling with a heat pump or a refrigerator.
• Surge capacity. Motor starting current is several times running current. Size the inverter for the surge, not the steady load.
• Country of purchase versus country of use. An inverter bought in one market and installed in another reintroduces exactly the mismatch this article is about. If you plan to buy the electrical package locally, order the blank-panel configuration and make the two decisions together.

For a grid-connected unit with solar, the same logic applies in reverse: the inverter must be certified to interact with the local grid, and that certification is always local. Pre-wire the roof penetration, conduit route and isolator position, and let the local installer supply the certified equipment.

Frequently Asked Questions

Can a 220V container home be converted to 110V?

In most cases, yes. The wiring, breaker panel and lighting circuits in an HG Prefab unit are sized so that a licensed electrician can re-terminate the panel for a 110V supply, and most LED lighting and electronic devices are already dual-voltage. The items that must be swapped rather than rewired are heating elements, water heaters, motors and any 220V-only appliance, because those are built for one voltage only. Tell us the destination country before production and we ship the correct configuration instead.

What plug type will my unit ship with?

Your unit ships with the socket and plug type you specify at the time of order. If no preference is given, the factory default is a Type I socket rated for 220V, because that is our domestic standard. Type A and Type B for North America, Type G for the UK and much of the Gulf, Type I for Australia and New Zealand, and Type C, E or F for most of Europe are all available as factory options, and we can also ship with a blank panel so your electrician fits local devices after delivery.

Does frequency (50 vs 60 Hz) matter for appliances?

Yes, but less than most buyers expect. Frequency affects anything with a motor or a compressor, such as air conditioners, heat pumps, refrigerators and washing machines, and it affects the transformer inside older-style power supplies. Lighting, phone chargers, laptops and most modern electronics are rated for both 50 Hz and 60 Hz and do not care. If your country runs 60 Hz and you plan to use mains-powered motors, buy those appliances locally and let the factory wire the circuit only.

Who should do the conversion?

A licensed electrician in the destination country, always. The factory builds and tests the installation, but the final connection to the local supply, earthing and bonding, RCD or GFCI protection and the inspection all fall under local licensing rules, and in most jurisdictions an unlicensed person may not legally make that connection. Every unit ships with a wiring diagram and a panel schedule so the electrician is not left guessing.