| One Bank-single phase and Neutral |
|
Mounting
Type |
MCB
Ways |
Box Assembly
Lis No |
+ |
Front
Plate
List No |
= |
Consumer
Unit
List No | |
|
| Without Hinged Protective Cover |
| Surface |
4 |
4 |
+ |
30 |
= |
104 |
| 6 |
6 |
+ |
30 |
= |
106 |
| 9 |
9 |
+ |
31 |
= |
109 |
| 12 |
12 |
+ |
32 |
= |
112 |
| Flush |
6 |
6 |
+ |
30/2 |
= |
106/2 |
| 9 |
9 |
+ |
31/2 |
= |
109/2 |
| 12 |
12 |
+ |
32/2 |
= |
112/2 | |
|
| Without Hinged Protective Cover |
| Surface |
4 |
4 |
+ |
30/1 |
= |
104/1 |
| 6 |
6 |
+ |
30/1 |
= |
106/1 |
| 9 |
9 |
+ |
31/1 |
= |
109/1 |
| 12 |
12 |
+ |
32/1 |
= |
112/1 |
| Flush |
6 |
6 |
+ |
30/3 |
= |
106/3 |
| 9 |
9 |
+ |
31/3 |
= |
109/3 |
| 12 |
12 |
+ |
32/3 |
= |
112/3 | |
|
| Maximum earth fault loop impedance in ohms for circuits supplying socket outlets (also fixed equipment in bathrooms). |
| Device |
Rating of Device |
| 5A |
15A |
20A |
30A |
45A |
| Type 1 MCB |
12 |
4 |
3 |
2 |
1.33 |
| Rewirable Fuse |
9.6 |
2.7 |
1.8 |
1.1 |
0.6 |
| House Service Fuse |
11.4 |
3.4 |
1.8 |
1.2 |
0.6 |
| Type 2 MCB |
6.8 |
2.3 |
1.7 |
1.1 |
0.75 |
| Type 3 MCB |
4.8 |
1.6 |
12. |
0.8 |
0.53 |
| Renard Service of Ratings |
|
|
|
|
|
| Device |
6A |
10A |
16A |
20A |
32A |
| Type 1 MCB |
10 |
6 |
3.75 |
3 |
1.87 |
| HRC Fuse |
8.7 |
5.3 |
2.8 |
1.8 |
1.1 |
| Type 2 MCB |
5.67 |
3.4 |
2.12 |
1.7 |
1.06 |
| Type 3 MCB |
4 |
2.4 |
1.5 |
1.2 |
0.75 | |
Note: At these values of loop impedance fuses will operate within 0.4 sec.and MCB’s will operate in 0.1 second Typical Operating Characteristics for Crabtree MCB’s
|
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