last question i promise!!

[seagullsy]

Different installation methods alter a conductors,

A - current carrying capacity,

B - voltage,

C - capacitance,

D - colour,

At first i thought it must be D colour because of the change from red/black to brown/blue, but im now thinking that actually by saying "conductor" it is refuring to the copper bit, and that hasnt changed, so i'm now thinking A is the correct answer,

any advice? greatfully recieved.

 

[Chri5]

A


Look / Google "reference methods"

 

[seagullsy]

A


Look / Google "reference methods"

ok thanks, looking now.

also, to save starting a new thread, fuses and circuit breakers dont detect earth faults no??

 

[Chri5]

Such outbursts need some validation, so why the less than polite post BAS ?

 

[leeco]

maybe you should try a painting and decorating course.

no offence to the painters on here

 

[holmslaw]

..

 

[Chri5]

Or paying silly money for galv trunking


(3-4" tray and boxing in would be far cheaper)

 

[seagullsy]

fuses and circuit breakers DO detect earth faults aswell then??

 

[flameport]

fuses and circuit breakers DO detect earth faults aswell then??

If you mean faults between live and earth, then the answer is Yes / Possibly / No.

Examples where the circuit breaker or fuse would operate:
TN supply - Live wire contacts an earth wire.
TN supply - Live wire contacts a metal part connected to earth such as a water pipe

Examples where the circuit breaker or fuse MIGHT operate:
TT supply - Live wire contacts an earth wire.
TT supply - Live wire contacts a metal part connected to earth such as a water pipe

Examples where the circuit breaker or fuse would NOT operate:
A person touches a live wire
Lawnmower cable sliced through, leaving live wires exposed on the grass.

 

[seagullsy]

fuses and circuit breakers DO detect earth faults aswell then??

If you mean faults between live and earth, then the answer is Yes / Possibly / No.

Examples where the circuit breaker or fuse would operate:
TN supply - Live wire contacts an earth wire.
TN supply - Live wire contacts a metal part connected to earth such as a water pipe

Examples where the circuit breaker or fuse MIGHT operate:
TT supply - Live wire contacts an earth wire.
TT supply - Live wire contacts a metal part connected to earth such as a water pipe

Examples where the circuit breaker or fuse would NOT operate:
A person touches a live wire
Lawnmower cable sliced through, leaving live wires exposed on the grass.

oh, heres the question in full, and maybe you will see why i'm stuck,

Fuses and circuit breakers detect..

A earth faults only

B overloads,short circuits and earth faults

C overloads and short circuits only

D short circuits and earth faults only

 

[ricicle]

Well a fuse or cb is there for overload purposes. And it is there for short-circuits (L/N or L/E). But will not detect earth faults (those with substantially higher impedance than a short-circuit)

So the answer is..................................

 

[seagullsy]

Well a fuse or cb is there for overload purposes. And it is there for short-circuits (L/N or L/E). But will not detect earth faults (those with substantially higher impedance than a short-circuit)

So the answer is..................................

i would now say...C?!!!

 

[ericmark]

Fuses and circuit breakers detect..

A earth faults only

B overloads,short circuits and earth faults

C overloads and short circuits only

D short circuits and earth faults only

The word to look at is "detect" and it does not "detect" an earth fault it "detects" an overload which can be caused by a short circuit or earth fault so the closest answer is (C)
With a circuit breaker there are two parts one to trip on overload the thermal part and one to trip on short circuit the magnetic part and I can see why short circuit is included but returning to question it does not "detect" a short circuit all it does is discriminate between different amounts of overload which are likely to relate to overload and short circuit. So it is a badly worded question.