IP Ratings
Installation · C&G 2365 Unit 203 · Full course section in Plus
IPXX codes look cryptic until you split them: the first digit runs from no protection up to dust-tight, the second from drips up to sustained immersion. An enclosure's rating tells you exactly what environment it can live in — and what it can't.
Electricians meet everywhere: outdoor sockets, bathroom zones, downlights in shower ceilings, dusty workshops. Exam questions usually hand you a location and ask for the digits, or hand you digits and ask what survives there.
Our questions drill both directions until the code reads like plain English.
This guide is free to read. There is no public quiz specifically for this topic yet. Explore the key terms below without leaving the page.
Common questions
- Can I try IP Ratings free on this page?
- This guide is free to read, but there is no public quiz specifically for this topic on this page. Browse public practice samples for other subjects, or create an account for the learning path. The full course section requires Plus.
- Where does IP Ratings sit in the City & Guilds scheme?
- maps to Unit 203. On TradeTraining it lives in the Installation section as bite-size lessons with practice questions.
- What do the two digits of an IP rating mean?
- The first digit rates protection against solid objects, from large surfaces down to dust; the second rates protection against water, from vertical drips up to continuous immersion. Higher is tougher in each case, and the two digits are independent of each other.
Explore key terms
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IP ratingIngress Protection rating
A two-digit code describing how well an enclosure keeps things out: the first digit rates protection against solid objects, from hands down to dust, and the second rates protection against water, from vertical drips to sustained immersion. The digits are independent, and an X in either position simply means that kind of protection hasn't been tested.
Read the full IP rating glossary entryBasic protection
Protection against touching live parts during normal, fault-free service. It is delivered by insulation around conductors, barriers and enclosures around terminals, and placing live parts out of reach. It is the first layer of shock protection; fault protection is the second, and an installation needs both.
Read the full Basic protection glossary entryConsumer unit
The distribution board of a domestic installation. A main switch, residual-current protection and a row of circuit devices on a DIN rail split the incoming supply into individually protected final circuits. Modern UK consumer units sit in non-combustible enclosures and increasingly give every circuit its own RCBO instead of sharing RCDs across banks.
Read the full Consumer unit glossary entry