PR S 40011

Question 1

What must be completed before restored equipment is brought back into service

Answer 1

it must be tested and certified correct

Question 2

what is a like for like

Answer 2

the replacement of an item with and exactly identical item, or deemed acceptable by a signal engineer

Question 3

What is the purpose of the like for like renewals process

Answer 3

to mitigate risks associated with the renewal of equipment

Question 4

what must licensed signalling personnel ensure when certifying renewals

Answer 4

the equipment renewed is of the correct type and configuration and no alteration to design has occurred

Question 5

Do you need a commissioning engineer for a like for like renewal

Answer 5

No

Question 6

When needs to happen if the item being replaced isn’t an exact identical replacement

Answer 6

Authorisation must be sought from the maintenance signal engineer or signal engineer in charge of the works to proceed under a like for like process.

Question 7

What documentation is required for general renewals work

Answer 7

Authorised design, works package, work instructions, test plan

Question 8

Can plug in relays be changed in-between trains

Answer 8

Yes

Question 9

What must be done prior to placing relays into service

Answer 9

it must be visually inspected for damage. Configuration check of the same voltage, type, contact configuration and pin coding.

Question 10

What must be done for magnetically latched relays before being placed into service

Answer 10

They must be driven down

Question 11

What level of importance is the replacement of shelf type relays classified as

Answer 11

safety-critical

Question 12

Can someone take over midway during a shelf relay replacement

Answer 12

No, it is not permitted

Question 13

What value must be tested when replacing a shelf relay

Answer 13

Shunt value, local and control track coil voltages are correct.

Question 14

precautions applied to the renewal of electrical signalling apparatus

Answer 14

-new equipment is inspected and tested to be correct type and order
-contacts to be changed over one at a time
-the renewal of mechanical equipment doesn’t affect operation
-all adjustments made beyond specified limits are approved by a signal engineer
-all adjusted equipment tested in situ

Question 15

What needs to be checked when a transformer is changed and when

Answer 15

polarity is tested before and after the change

Question 16

what must be done before the disconnection of wiring or removal of equipment

Answer 16

The wiring is to be correlated

Question 17

what must happen with de-commissioned or yet to be commissioned equipment

Answer 17

de-commissioned equipment must be disconnected from use. new wires unconnected until officially commissioned. exposed wires insulated, secured and labelled.

Question 18

What must happen before disconnections or connections

Answer 18

the circuit is to be booked out of use

Question 19

what should happen with spare wires

Answer 19

Terminated on spare terminals in racks. Track side apparatus shall have the ends insulated if there are no spare terminals.

Question 20

What must happen with equipment not in use

Answer 20

it must be disconnected from the interlocking, open circuited and labelled

Question 21

Can you use adhesive devices to insulate prepared wiring

Answer 21

no, as it can leave residue causing unreliable contact resistance

Question 22

are test lamps allowed to be used

Answer 22

no, they can provide a significant earth leakage path.

Question 23

Who must be consulted if a specific work instruction is not provided

Answer 23

The signal engineer for the works

Question 24

Some examples where a like for like is not applicable and authorisation is required

Answer 24

-a trainstop with closed contacts replaces one with open contacts
-shelf replaced with a plug in conversion
-newer version of point machine replaces an earlier version

Question 25

What are 3 risks to be assessed if the equipment to be installed is not identical

Answer 25

the difference between the equipment, the effect on design principle and the risks associated with the change

Question 26

What must happen when the instructions or information is not understood

Answer 26

A signal engineer is to be consulted

Question 27

What equipment do like for like procedures pertain to

Answer 27

Trackside equipment

Question 28

What is the purpose of a like for like

Answer 28

To mitigate risks associated with the renewal/replacement of equipment

Question 29

Examples of NON- like for like

Answer 29

Conversion of incandescent to LED signal
Changing of LED signal to another type
Change of track circuit type
Conversion of conventional points to Clawlock/SpherolockD

Question 30

Documentation required in a like for like package

Answer 30

Authorisation/Scope of works
Equipment specific work instructions
Circuit diagrams/Analysis sheets
IBA
Temporary bridging/circuit diagrams
TIP/Signalling plans
Returns

Question 31

what are the 7 parts to a like for like works package

Answer 31

Authorisation
Equipment specific Work instructions
IBA
Circuit diagrams
Bridging authority and Circuit diagrams
Signalling Plan
TIP
Return forms

Question 32

Like for Like renewal refers to the replacement of an item with an identical item. It can also
refer to an item that is not identical where it is deemed acceptable by a signal engineer on
the following basis

Answer 32

The replacement item is of a similar characteristic footprint
Where the difference does not diminish the intended design principle