Reference tables may use different nominal labels. Never widen a device's rated input range by rounding 220, 230 and 240 together.
The key check
Reference tables may use different nominal labels. Never widen a device's rated input range by rounding 220, 230 and 240 together.
| Item | What to read |
|---|---|
| Device | AC INPUT voltage, frequency, current and earth requirement |
| Adapter | Input/output plug variants, earth path and AC rating |
| Property | Exact socket, supplied voltage and condition |
What changes the answer
Nominal labels can come from standards, historical practice or manufacturer comparison tables. The country page preserves the researched value and any conflict flag. Your appliance's stated minimum and maximum INPUT voltage determine whether a particular value falls inside its rating; do not round the label to make it fit.
Decision table for this question
| Situation | Meaning | Next step |
|---|---|---|
| Label says exactly 220V | Do not expand the range by rounding | Check if the maker explicitly permits 230V/240V |
| Label says 100–240V | The nominal reference can fall inside this range | Still check frequency and the connection chain |
| Sources disagree on a country value | A single number is not settled | Ask the property about its actual outlet |
Use this before plugging in
- Find the AC INPUT label on the exact appliance or power brick. Write down the stated voltage and frequency range.
- Confirm the actual destination outlet voltage and socket variant; a country reference cannot tell you what a particular room has.
- Trace the physical plug and protective earth through each adapter. Read the lowest AC current rating in the chain.
- If a condition is missing or the maker excludes the appliance, leave the setup unconnected and seek a rated alternative.
Common shortcut to avoid
A familiar plug shape or a broad USB wattage claim is not a substitute for AC voltage, grounding and load checks. The distinctions in the table above are screening data; they do not certify a particular hotel outlet or product.
Use the device checker · Find a destination
Questions travelers still ask
What if label says exactly 220V?
Do not expand the range by rounding. Check if the maker explicitly permits 230V/240V.
What if label says 100–240V?
The nominal reference can fall inside this range. Still check frequency and the connection chain.
What if sources disagree on a country value?
A single number is not settled. Ask the property about its actual outlet.
Sources and scope
Electrical Safety First . Research reviewed 2026-11-01; no outlet measurement or hands-on product test. Send a correction