Small Wiring Nomenclature TS 50-19 (BEBS S12) Flashcards
1
Q
A, B, C
A
Protection Class CTs
Safety Implication: DO NOT OPEN CIRCUIT
2
Q
D
A
Metering Class CTs
3
Q
E, F, G
A
VTs
SAFETY IMPLICATION: AC voltage <110V
4
Q
H
A
Mains (230/400V AC) odd numbers = live even numbers neutral
SAFETY IMPLICATION: AC and AC/DC supplies
5
Q
J
A
DC supplies odd numbers +
SAFETY IMPLICATIONS: DC supplies, could be unfused
6
Q
K
A
Controls: circuit breakers opens, closes, trips odd numbers +
7
Q
L
A
Indications and Alarms odd numbers +
8
Q
S
A
Analogue Transducers odd numbers +
9
Q
T
A
Pilot Cables
10
Q
M
A
Auxiliary and control motor devices
SAFETY IMPLICATIONS: could be motor supply 240/415V
11
Q
G
A
Synchronising Bus Wires
12
Q
R
A
Interlocking
Danger: 110V DC
(screening may be needed because not all can be isolated e.g. OLC wiring)
