Safe Isolation, Termination and Connection of conductors
Safe isolation, GS Guidance for Safety, safe procedures, test equipment, connections and connection methods, cable types - 10 questions from a bank of questions
What is the Guidance for Safety (GS) reference number for 'Safe Electrical Isolation'?
GS28
GS38
GS48
GS58
Which one of the following is not good practice when carrying out safe isolation?
locking the fuseboard cover and placing warning notices
turning off the circuit breaker and starting work
locking a fuseboard cover and keeping the key in your pocket
using a mcb locking device prior to locking the fuseboard cover,
Which regulation covers working on or near live electrical supplies?
HASAW
EAW
PUWER
MHSW
Which one of the following statements shows the correct 'safe isolation' sequence?
1. identify circuit to be worked on 2. isolate and lock off 3. prove voltage tester on proving unit 4. fit notices 5. begin work
1. identify circuit to be worked on 2. isolate circuit 3. prove voltage tester on proving unit 4. check circuit is dead, lock off and fit notices 5. begin work
1. identify circuit to be worked on 2. isolate circuit 3. prove voltage tester on proving unit 4. check circuit is dead and re-prove tester 5. lock off, fit notices and begin work
1. identify circuit to be worked on 2. isolate 3. prove voltage tester on proving unit 4. check circuit is dead and re-prove tester 5. fit notices and begin work
Which one of the following is not a GS38 standard requirement for voltage indicating devices?
finger guards
current-limiting resistor
10mm exposed tips
internal HRC fuse
What should be done with a voltage indicating device BEFORE using it on a live supply?
it should be cleaned
it should be proved
it should be tested on another supply
it should be taken apart and serviced
Where is the most suitable location to isolate a live supply to a circuit in a domestic installation?
in the local substation
at the mains intake position
at the point of distribution for that circuit
at the end of the circuit concerned
You are about to isolate a circuit in a busy office. You notice that the circuit to be isolated has already had its mcb switched off in the fuseboard. What action would you take?
its off already, so check circuit is actually dead, lock-off and begin work.
its off already so carry out the full GS38 isolation procedure and begin work.
switch it back on, check it is on, then carry out the full GS38 isolation procedure before beginning work.
investigate why it is already off
Conductor connections must possess two basic properties. One is mechanical strength, what is the other?
electrical strengtrh
magnetic strength
chemical strength
metallic strength
Which type of connection requires a ratchet-type tool and special terminals?
soldered
crimped
screwed
welded
Which type of connection requires the conductor cores to be heated and joined?
soldered
crimped
screwed
welded
What type of connection joins conductor cores in a terminal block?
soldered
crimped
screwed
welded
Where would you find CAT 5 and CAT 6 cable systems?
data/comms systems
mains supply systems
extra-low voltage lighting circuits
in factory wiring for machines
What term is given to the corrosion caused by two dissimilar metals being joined together in the presence of moisture?
electrolytic effect
galvanising effect
osmosis effect
corrosion effect
If a live electrical connection becomes loose, what is the likely outcome
no effect on the circuit operation
a low resistance joint will form
a high resistance joint will form
the circuit breaker will operate
What is the preferred method of ensuring that electrical connections are of sufficient tightness
tighten the connection until you feel the cable begin to crush
tighten the connection for max 3 turns
tighten the connection using a torque-driver
re-check connections at least every year
identify the method used to attach a 'ring-crimp' to a core of a 185mm/sq SWA cable
hand crimper
hydraulic crimper
automotive crimper
hammer and punch
identify the appropriate instrument to check that a source of supply has been switched off.
multimeter
martindale tester
approved voltage-indicating device
voltmeter
Identify the function of a 'proving unit'
it proves that the mains supply is live
it proves that your voltage tester is working correctly
it proves that the mains is at 230v
it proves that the polarity of the mains is correct
Identify the part within a GS-approved Voltage Tester that would primarily protect the tester from explosive damage should a short circuit in the tester during use
robust construction
2mm tips
double-insulated leads
internal HRC fuse
Identify the part within a GS-approved Voltage Tester that would primarily protect the tester from electric shock should damage occur to the tester during use