EasyFox

Answers
1) B
2) C
3) C
4) A ......sorry slip of the finger question should read section 711
5) D
6) A
7) D
8) D
9) B
10) D

A few more for you to try.

(1) For circuits having a nominal voltage above 500v, the minimum insulation resistance is
a) 0.25Mohm
b) 0.5Mohm
c) 1Mohm
d) 5Mohm

(2) A final circuit supplying 13A socket outlets is to be used by ordinary persons. The circuit must be provided with.
a) protection by an rcd
b) a BS EN 60898 circuit breaker
c) additional protection in accordance with regulation 415.1
d) switched socket outlets

(3) where thermoplastic insulated & sheathed cables are installed in a plastered wall at a depth of 20mm & are not protected against mechanical damage they must be.
a) run in safe zones
b) protected by a 30mA rcd
c) coloured red
d) run in safe zones and protected by a 30mA rcd

(4) wher an rcd may be operated by an ordinary person, it shall be installed so that.
a) it is no more than 0.5 meters from floor level
b) any time delay setting can only be adjusted by the use of a tool
c) its setting cannot be seen without the use of a tool
d) any exposed conductive parts are out of reach

(5) where cable is surrounded by thermal insulation for 200mm of its length, the cable current carrying capacity must be de-rated by a factor of
a) 0.5
b) 0.63
c) 0.8
d) 0.88

(6) Busbar trunking systems must
a) meet the standards of BS EN 60438-2
b) be installed vertically
c) be installed according with manufacturers instructions taking account of external influences
d) be rated less than the rating of the circuit breaker protecting it.

(7) when rcd's are used to provide automatic disconnection in case of a fault the disconnection times given in table 41.1 relate to values of current
a) significantly higher than the rated residual operating current
b) five times the residual operating current
c) the residual operating current
d) equal to the prospective earth fault current

(8) which of the following is not considered by a designer when designing a substation.
a) quality of the earthing system
b) resistance of the earthing arrangement
c) maximum level of earth fault current
d) the comsumers bonding arrangements

(9) the max permitted EFLI for a 230v single phase circuit forming part of a TT system & protected by a 500mA rcd is
a) 100 ohm
b) 200 ohm
c) 500 ohm
d) 1667 ohm

(10) the maximum disconnection times stated in table 41.1 apply to
a) all final circuits
b) socket outlets on the ground floor
c) final circuits not exceeding 32A
d) all socket circuit outlets

(11) a socket outlet circuit in a factory must be
a) mounted at least 1.2 meters from the floor
b) protected by a 300mA rcd
c) specifically labelled for the use with a particular item of equipment or 30mA rcd protected
d) 30mA rcd protected if it is to be used for equipment outside

(12) the max permitted disconnection time for a 6A lighting system forming part of a TN-C-S system is
a) 5 seconds
b) 0.4 seconds
c) 200 milliSeconds
d) 40 milliseconds

(13) in a TT system when an overcurrent protective device is used the following condition must be met: Zs x Ia < Uo....... Ia represents
a) the current causing operation of the device within the time stated in table 41.1
b) the prospective fault current
c) the nominal rating (In) of the device
d) 30mA