to the 16th Edition IEE Regulations
   
   
   
 
 

chapter 5
Earthing

chapter 6
Circuits

Inspection and Testing
  8.1 - Introduction 8.5 - Insulation tests
  8.2 - Inspection 8.6 - Earth testing
  8.3 - Testing sequence 8.7 - Test instrument requirements
8.4 - Continuity tests 8.8 - Supporting paperwork


8.1.3 - Information needed by the tester

The installation tester, as well as the user, must be provided with clear indications as to how the installation will carry out its intended purpose.

Table 8.1 - Typical schedule of circuits
 
Circuit Fuse
(BS 88)
Cable Feeding
A1
32A
2.5mm˛ p.v.c. (X) Ring circuit, printing section
A2
32A
2.5mm˛ p.v.c. (X) Ring circuit, drawing office sockets
A3
32A
2.5mm˛ p.v.c. (X) Ring circuit, main office sockets
A4
32A
4.0mm˛ p.v.c. (Z) Store room printer
A5
spare
-
-
A6
spare
-
-
-
-
-
-
B1
10A
1.5mm˛ p.v.c. (Y) Lighting, printing section
B2
10A
1.5mm˛ p.v.c. (Y) Lighting, drawing office
B3
10A
1.5mm˛ p.v.c. (Y) Lighting, main office
B4
10A
1.5mm˛ p.v.c. (Y) Lighting, corridors and toilets
B5
spare
-
-
B6
spare
-
-
-
-
-
-
C1
32A
2.5mm˛ p.v.c. (X) Ring circuit, paper store
C2
32A
2.5mm˛ p.v.c. (X) Ring circuit, binding section
C3
spare
-
-
C4
spare
-
-
C5
10A
1.5mm˛ p.v.c. (Y) Lighting, paper store
C6
10A
1.5mm˛ p.v.c. (Y) Lighting, binding section

To this end, the person carrying out the testing and inspection must be provided with the following data:

1. - the type of supply to be connected, ie single- or three- phase

2. - the assessed maximum demand (6.2.1)

3. - the earthing arrangements for the installation

4. - full details of the installation design, including the number and position of mains gear and of circuits, (see {Table 8.1},{Fig 8.1} and {Table 8.2} for a typical example)

5. - all data concerning installation design, including calculation of live and protective conductor sizes, maximum demand, etc.

6. - the method chosen to prevent electric shock in the event of an earth fault.

7. - a list of all circuits or equipment vulnerable to damage by testing (see{8.2.1 item 3})

Without this complete information the tester cannot verify either that the installation will comply with the Regulations, or that it has been installed in full accordance with the design.

Fig 8.1 Typical mains gear schematic diagram. See also {Tables 8.1 & 8.2}


Table 8.2 - Typical mains gear schedule
Item
Situation
Supplying and type
Cable size
BS 88 fuse size
Dist.board A
-
2-way 30A
TP&N
Switch room
Sockets
Ground floor
16mm˛ p.v.c.
(S)
4 x 32A
(2 spare ways)
Dist.board B
-
2-way 15A
TP&N
Switch room

Ground floor
Lighting
6mm˛ p.v.c.
(T)
4 x 10A
(2 spare ways)
Dist.board C
-
2-way 30A
TP&N

Upper store


Upper floor
Installation

16mm˛ p.v.c.
(S)

2 x 32A
2 x 10A
(2 spare ways)
Board A
-
Switch-fuse
60A TP&N
Switch room

Dist. Board A

16mm˛ p.v.c.
(S)
3 X 60 A
Board B
-
Switch-fuse
30A TP&N
Switch room

Dist. Board B

6mm˛ p.v.c.
(T)
3 X 30 A
Board C
-
Switch-fuse
60A TP&N
Switch room

Dist. Board C

16mm˛ p.v.c.
(S)
3 X 60 A
Main fuse-
switch
-
100A TP&N
Switch room

Complete
installation

70mm˛ p.v.c.
(R)

3 x 100 A

 

 

 

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Extracted from The Electricians Guide Fifth Edition
by John Whitfield
Published by EPA Press Click Here to order your Copy

Click here for list of abbreviations