Level 2 · Plumbing revision

Electrical Safety & Isolation revision notes

Safe isolation, bonding and earthing awareness, bathroom zones and the scope of Part P.

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C&G Unit 209: Safe Electrical Isolation & Part P

Revision card

Earthing and equipotential bonding for plumbers

Why metal pipework is bonded, what main and supplementary bonding do, and why a plumber must not remove it.

Checklist

Safe electrical isolation steps

The disciplined sequence for proving a circuit dead before working on or near it.

Calculations: Ohm’s law & power

Worked example

Choosing a plug-top fuse from appliance power (worked example)

A worked example of picking the correct plug fuse from an appliance power rating.

Worked example

Ohm’s law and power (worked example)

Finding current and resistance for an immersion heater using V, I, R and power relationships.

Keep electrical awareness and practical competence separate

When revising bathroom zones, bonding or safe isolation, identify the installation conditions and what the question actually asks you to establish. Knowing a component name is different from proving that a circuit is safe to work on.

These plumbing-focused notes introduce the safety principles. The 18th Edition notes cover wider electrical-installation topics, while inspection and testing revision focuses on measurements and interpretation. Reading either set does not establish practical competence.

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