Cable Calculations - terms, symbols, factors, values, protection
Cable calculation terms, symbols and data - 5 random questions from a bank of 38 questions
© K.Brown 2025.
Drag and drop (mouse left button, click and hold) the terms on the right to the correct terms on the left.
Instructions
Drag the items on the right ONTO the correct items on the left.
When you have finished - click the CHECK button. Incorrect answers will show as BLACK.
re-Drag and Drop any incorrect answers and click the CHECK button. Keep correcting until you have them ALL CORRECT.
NOTE: if you have had any re-attempts the score will not show 100% but all correct answers will show as WHITE
© K.Brown 2025
Ib
In
It
Iz
Ca
Cg
Ci
Cf
Vd
correction factor = 1.00
correction factor = 0.725
11.5v
6.9v
20v
0.4 sec
5 sec
0.2 sec
BS3036
BS88
BSEN60898
MCCB
RCCB/RCBO
BS61008
BS61009
type 'S'
RCBO
200mS
40mS
30mA
Volts Drop = mV x design current x ?
? = mV x A x m
Vd = mV x ? x m
protective device rating/correction factors = ?
circuits installed in conduit/trunking
circuits installed on cable trays
circuits 'clipped direct' to a wall
max volts-drop for non-lighting circuit
max volts-drop for lighting circuit
Cc
design current (the current required by the load)
protective device rating
current value when factors have been applied
cable current-carrying capacity
factor for room temperature
factor for multiple circuits/condutors run together
factor for thermal insulation
factor for bs3036 fuse
voltage loss in a conductor
ambient temp = 30 degrees C
bs3036 fuses
max volts-drop for 230v non-lighting circuit
max volts-drop for 230v lighting circuit
max volts-drop for 400v circuit
max disconnection time for a TN system circuit below 32A
max disconnection time for a TN system circuit above 32A
max disconnection time for a TT system circuit below 32A
semi-enclosed fuse
HRC fuse
miniature circuit breaker
circuit breaker in its own enclosure
combined mcb and rcd
RCCB
RCBO
time-delayed RCD
combined rcd and mcb (with overload protection)
RCD trip time at x1
RCD trip time at x5
rating of RCD for additional protection
length
Vd
Amps
Tabulated current
Installation reference method B
Installation reference method F
Installation reference method C
5%
3%
Correction factor for circuits buried in the ground