Design
Most common used scale on synoptic floor plans.
1:50
First step of cable calculations?
Ib=P divided by Voltage (single phase)
What table is for finding Ca factor ( OSG )
Table F1
On this page on the 18th edition you find the list of all correction factors
page 424
It is recommended to wire the lighting circuits by ... method.
2 plate
It is recommended that lights are placed in a ... pattern on a floor/building plan
symmetrical
How many cable calcs steps are there?
10
What page is It table found on the 18th edition for 70 degrees thermoplastic flat cable
page 456
This table in OSG shows the R1+R2/m values
table I1 OSG
Draw the symbol for 2 gang switches socket outlet
go on
Where the CCU should be placed?
In a accessible yet hidden place (hidden for aesthetic purposes, accessible for maintenance)
How is diversity taken in account for a cooker circuit in domestic premises? (formula)
Ib - 10A, 30% of the remainder then +10A (+5A if socket incorporated)
Ze values for TNCS, TT and TNS systems?
TNCS- 0.35 Ohms
TT- 21 Ohms
TNS-0.8 Ohms
It and mV/a/m tables start from this page on the 18th edition
page 448
Draw the symbol for a intermediate switch
go on mate
Where to place the switches on a floor plan?
In the most accessible way ( e.g 2 way switching if 2 exits/entries in the room, one at each door)
Adiabatic formula?
S= Square root of I squared times t divided by k
What is the Ca value for a 70 degree thermoplastic cable at a 25 degree ambient temperature?
1.03
Cc factor values
1 if circuit is above ground, 0.9 if buried in the ground
What IP ratings should a socket outlet have if positioned in a location containing shower/bath? Consider all zones (0,1,2)
IPX7 for zone 0
IPX4 for zone 1-2
It is recommended that in the bathrooms an ... is installed.
extractor fan
Step 8 of cable calcs?
Cant be asked to type it in
Say all 10 steps of cable calcs including formulas and tables/pages
Go on mate
Spell the name of the formula found at page 199
A D I A B A T I C
How many socket outlets can you put on one circuit?
There is no fixed number, it all depends upon the loads connected to the circuit.