# Domestic electrics: understand it, and know where to stop

*Part P, safe isolation, and the difference between an installation that is old and one that is dangerous.*

## Production summary

- Modules to record: 2
- Total script: 1176 words, about 8 minutes of finished audio
- Voices: Amara (host) and Nadia (practice educator)
- Level: Homeowner to grounding before formal training

## Accreditation wording that must appear in the description

- **The CPD Certification Service** (planned): Application scheduled.
- **BS 7671 18th Edition** (aligned): Written against the current national standard. Alignment is our own mapping and implies no endorsement by the IET or any certification scheme.

> Do not upgrade any of these words in a description or a thumbnail. Aligned is not accredited, and planned is not approved.


---

## What you may legally do, and what must be certified

**Runtime** about 4 minutes. **Words** 545. **Starts at** 00:00 in the full course recording.

### Learning outcomes to state on camera

- Explain Part P and identify notifiable work
- Describe the three routes to compliance for notifiable work
- Explain what BS 7671 is and what it is not
- Recognise an installation that is unsafe rather than merely old

### Script


`[CUE 1]` *Notifiable versus non notifiable work, sorted into two columns.*

**AMARA**  [00:00]
Am I allowed to do electrical work in my own house?

**NADIA**  [00:04]
Yes, which surprises people, and it is a heavily qualified yes. Part P of the Building Regulations covers fixed electrical installations in dwellings in England and Wales, and some work is notifiable.

**AMARA**  [00:17]
Meaning?

**NADIA**  [00:17]
Meaning building control has to be involved. A new circuit is notifiable. A consumer unit replacement is notifiable. And work in a special location, which in practice means within the zones around a bath or a shower, is notifiable.


`[CUE 2]` *Bathroom zones diagram showing where work becomes notifiable.*

**AMARA**  [00:33]
And changing a socket?

**NADIA**  [00:34]
Not notifiable, on an existing circuit outside a special location. But hear the distinction, because this is where people go wrong. Non notifiable does not mean unregulated. It still has to comply with the standard and it still has to be tested.

**AMARA**  [00:51]
So how do I lawfully do notifiable work?

**NADIA**  [00:54]
Three routes. Use an electrician registered with a government authorised scheme, who self certifies and notifies for you. Notify building control yourself before you start, pay their fee and let them inspect. Or use a registered third party certifier, which is rare.


`[CUE 3]` *Three lawful routes, with the unnotified fourth crossed out and its consequences.*

**AMARA**  [01:11]
And the fourth route, which is doing it and saying nothing?

**NADIA**  [01:16]
Is not a route. And it catches people years later, not at the time. It shows up in a conveyancing search when you sell, it can hold up the sale, and it can invalidate your insurance if there is a fire.

**AMARA**  [01:32]
Which route is actually cheapest?

**NADIA**  [01:34]
Almost always the registered electrician. People assume notifying building control themselves saves money and it very often costs more, because the fee is substantial and they may require third party testing anyway.


`[CUE 4]` *BS 7671 shown as a standard sitting beneath the Electricity at Work Regulations.*

**AMARA**  [01:47]
Where does BS 7671 fit? People quote it like law.

**NADIA**  [01:51]
It is not law. BS 7671, the IET Wiring Regulations, is the national standard. Complying with it is the accepted way of showing you have complied with the Electricity at Work Regulations and with Part P, which are the legal bits.

**AMARA**  [02:07]
Does that mean my old wiring is now illegal?

**NADIA**  [02:11]
No, and this matters because people get frightened into unnecessary rewires. The standard changes, and an installation that complied when it was built does not become illegal when a new edition lands.


`[CUE 5]` *Old but acceptable beside genuinely dangerous, with photographs of each fault type.*

**AMARA**  [02:24]
Then how do I tell old from dangerous?

**NADIA**  [02:27]
That distinction is the most useful thing in this module. Old but often fine: no RCD on every circuit, an older metal consumer unit, sound wiring in pre 2004 colours.

**AMARA**  [02:39]
And dangerous?

**NADIA**  [02:40]
Rubber or lead sheathed cable, which is pre 1970 and perishes until the insulation literally crumbles off in your hand. No earthing to metal accessories. Scorching or arcing marks at the fuse board. Any sign of amateur additions in a bathroom.


`[CUE 6]` *Warm socket and scorched consumer unit as stop signs.*

**AMARA**  [02:56]
What about the smaller signs?

**NADIA**  [02:58]
A socket that is warm to the touch. A burning smell you cannot place. Cracked accessories. Any of those, stop using that circuit and get somebody in. Warm sockets are loose connections, and loose connections are how electrical fires start.

**AMARA**  [03:14]
So what is the honest advice?

**NADIA**  [03:16]
Learn this properly so you understand your own house, can judge a quote, and can spot something dangerous. Then use a registered electrician for anything notifiable. That is not me being cautious for the sake of it. It is cheaper, it is certified, and it does not surface when you try to sell.

### Sources for the on screen credit

- Approved Document P: Electrical safety, dwellings, Ministry of Housing, Communities and Local Government
- BS 7671 Requirements for Electrical Installations, IET
- Electricity at Work Regulations 1989, legislation.gov.uk
- Registered competent person electrical schemes, Electrical Safety First

---

## Safe isolation, and what protects you

**Runtime** about 4 minutes. **Words** 631. **Starts at** 03:38 in the full course recording.

### Learning outcomes to state on camera

- Carry out the safe isolation procedure in the correct order
- Explain why a voltage indicator must be proved before and after
- Distinguish between an MCB, an RCD, an RCBO and a fuse
- Explain earthing and bonding and why they are not the same thing

### Script


`[CUE 1]` *Six step safe isolation sequence, with the second prove highlighted.*

**AMARA**  [03:38]
If there is one thing in this whole course, what is it?

**NADIA**  [03:42]
Safe isolation. It is not a technique, it is a discipline, and it is what keeps electricians alive. Six steps, fixed order, never shortened.

**AMARA**  [03:52]
Take me through it.

**NADIA**  [03:54]
Identify the circuit. Isolate it at the consumer unit at the correct device. Secure the isolation with a lock off and a label, so nobody switches it back on while your hands are in there. Prove your voltage indicator on a known live source. Test the circuit at the point of work. Then prove your indicator again.

**AMARA**  [04:16]
Why prove it twice? That feels like belt and braces.


`[CUE 2]` *Failed indicator giving a false dead reading on a live circuit.*

**NADIA**  [04:20]
It is the most important step in the sequence and it is the one everybody drops.

**AMARA**  [04:27]
Explain.

**NADIA**  [04:27]
Suppose your indicator fails between the first prove and the test. You put it on a live circuit, it shows nothing, and you conclude the circuit is dead. You have just been given a false negative by a broken instrument. Proving it again afterwards is the only way to know the reading you trusted was real.

**AMARA**  [04:50]
What about a neon screwdriver? Everybody's dad has one.

**NADIA**  [04:53]
Throw it away. They give false readings from induced voltage, they can fail to indicate a genuinely live conductor, and their whole design puts your body in the current path. Two pole voltage indicator to GS38, and prove it.


`[CUE 3]` *Neon screwdriver crossed out beside a GS38 two pole indicator.*

**AMARA**  [05:09]
Can I not just turn the light switch off?

**NADIA**  [05:12]
No, and this is where people get hurt in their own homes. A switch interrupts the line in normal operation. It does not guarantee the fitting is dead.

**AMARA**  [05:24]
Why not?

**NADIA**  [05:24]
Older installations sometimes have the neutral switched instead of the line, so the fitting is live with the switch off. Then there is two way switching, borrowed neutrals between circuits, shared lighting circuits. A fitting can be fed from somewhere you did not expect.

**AMARA**  [05:42]
So isolate at the board.


`[CUE 4]` *Switched neutral fitting: switch off, fitting still live.*

**NADIA**  [05:44]
Isolate at the board, and test at the point of work rather than trusting the label. Consumer unit labels are wrong more often than they are right, especially in a house that has been extended.

**AMARA**  [05:58]
Let us do protective devices, because I have never understood the difference.

**NADIA**  [06:03]
Then here is the sentence that fixes it. A fuse or an MCB protects the cable. An RCD protects you.

**AMARA**  [06:11]
The MCB does not protect me at all?

**NADIA**  [06:14]
Not from a shock, no. Its job is to stop the wiring in your walls overheating and catching fire. It will not operate anywhere near fast enough to save a person.


`[CUE 5]` *RCD comparing line and neutral current with 30mA leaking through a person.*

**AMARA**  [06:26]
And the RCD?

**NADIA**  [06:28]
It compares the current going out on the line with the current coming back on the neutral. If there is a difference of around thirty milliamps, that current is going somewhere else. Through you, into the earth. It disconnects in well under a second. That device is the difference between a fatal shock and a very unpleasant one.

**AMARA**  [06:51]
And an RCBO?

**NADIA**  [06:52]
Both, for one circuit. Which is why a modern board with RCBOs does not black out the whole house because a kettle faulted.

**AMARA**  [07:01]
Last one. Earthing and bonding. Same thing?


`[CUE 6]` *Earthing path back to source beside bonding holding pipes at equal potential.*

**NADIA**  [07:04]
Different jobs, constantly confused. Earthing gives fault current a low resistance path back to the source so the protective device trips quickly and clears the fault.

**AMARA**  [07:14]
And bonding?

**NADIA**  [07:15]
Bonding connects the metal things you might touch, incoming water and gas pipes, to the main earthing terminal. Not to carry fault current away, but to hold them all at the same potential, so there is no voltage difference between the pipe and the tap and you standing between them.

**AMARA**  [07:35]
So earthing clears it, bonding stops the difference in the meantime.

**NADIA**  [07:40]
That is exactly it, and if you remember that one line you are ahead of a lot of people who work on this for a living.

### Sources for the on screen credit

- BS 7671 Requirements for Electrical Installations, IET
- GS38: Electrical test equipment for use by electricians, Health and Safety Executive
- HSG85: Electricity at work, safe working practices, Health and Safety Executive
- Consumer guidance on RCDs and electrical safety, Electrical Safety First

---

*Copyright WAJD Group. Built by WAJD AI.*