Regulations

Question 1

The regulations state…

The voltage drop of a power circuit must not exceed…what?

Answer 1

5% of the nominal voltage.
In practical terms (230V), a volt drop of more than 11.5V would be against regs.

Question 2

The regulations state…

The voltage drop of a lighting circuit must not exceed…what?

Answer 2

3% of the nominal voltage.
In pracitcal terms (230V), a volt drop of more than 6.9V would be against regs.

Question 3

According to regulations…

What is Zone 0?

Answer 3

Inside a bath or shower tray.

Question 4

According to regulations…

What is Zone 2?

Answer 4

Zone 2 is anywhere within 0.6m of Zone 1/ 0. Ie. within arms reach.

Question 5

According to the regulations…

What is Zone 1?

Answer 5

The area of space directly above Zone 0.

Question 6

According to the regulations…

How tall are each of the zones in a bathroom?

Answer 6

2.25m tall.

Question 7

What are the two voltages that make up Band 1?

Answer 7

< 50V AC
< 120V DC

Question 8

What are the two voltages that make up Band 2?

Answer 8

51 - 1000V AC
121 - 1500V DC

Question 9

What is the maximum trip time allowed for a circuit using a BS61008 RCD, when half of the design current is applied to it?

Answer 9

It should not trip

Question 10

What is the maximum trip time allowed for a circuit using a BS61008 RCD, when 100% of the design current is applied to it?

Answer 10

300ms

Question 11

What is the maximum trip time allowed for a circuit using a BS61008 RCD, when 500% of the design current is applied to it?

Answer 11

40ms

Question 12

What is the name of the statutory regulations which set out specific safety standards that are aimed at protecting the public & consumers from the dangers of electricity?

Answer 12

Electricity Safety, Quality and Continuity Regulations 2002

Question 13

True or false:
The BS7671 applies to all electrical work.

Answer 13

False.
The BS7671 only applies to installations whose operating voltage is up to 1000V.

Question 14

What are the seven steps in safe isolation?

Answer 14

1. Identify the sources of supply
2. Isolate the supply
3. Secure the isolation
4. Test the voltage indicator
5. Test system dead
6. Retest voltage indicator
7. Begin work

Question 15

True or false:
The key used to secure an isolation must be unique to that particular locking device.

Answer 15

True.
This is to ensure that nobody can inadvertantly turn the supply back on.

Question 16

What were the old colours for single phase installations pre April 1st 2004?

Answer 16

Live - Red
Neutral - Black
Earth - Green

Question 17

What were the old colours for three phase installations pre April 1st 2004?

Answer 17

Live 1 - Red
Live 2 - Yellow
Live 3 - Blue
Neutral - Black
Earth - Green