Page 518 - IRSEM_Main Book

Note: (i) FAT should preferably be conducted at factory premises. However, FAT can
also be done at railway premises at central location but not at the site. For this,
the setup should be made by all the Zonal Railways.
(ii) FAT & SAT should be done by separate officials where ever feasible.

21.5.3 Power Supply for Electronic Interlocking

(a) Adequate redundancy in power supply arrangements for E.I systems including
Control Terminals shall be provided as per approved specifications and
guidelines.

(b) Wires connecting equipment shall be of adequate size so that there is not
more than 0.5% loss in voltage.

(c) The power supply for fan shall be fed with separate external supply, which
should be completely isolated from Electronic interlocking supply and
same shall be provided with fuse.

21.5.4 Lightning & surge protection, Earthing: Shall be done as per Section 7 of
this chapter

21.5.5 Testing & Commissioning of Electronic Interlocking:

Wiring, Testing & Commissioning shall be done as per Para 19.8.5 to 19.8.12.

Recommended check list of items for commissioning is given at Annexure:21-
A2. This list may be suitably modified as needed.

Section 6: Maintenance of Interlocking

21.6.1 Periodicity of Tests (for existing installations - Relay interlocking/Electronic
Interlocking)

All the tests indicated in this chapter shall be conducted at the time of new
installation or making any alteration to the existing installations.

(a) In a working installation, the following periodical tests shall be done:

(i) Physical inspection once in a year or earlier as feasible.

(ii) System integrity test as per para 19.8.8 once in five year or earlier if
interlocking is altered.
(iii) Insulation tests on Cables as per Chapter 15 of SEM.

(iv) Test of individual equipment in accordance with specifications and
instructions applicable for each apparatus as stipulated in current
Chapter.

(b) It will be personal responsibility of SSE/JE(Signal) to test all Electrical
signalling circuits of relay interlocking up to 20 routes.

(c) It will be personal responsibility of ASTE/DSTE concerned to test all
electrical signalling circuits of relay interlocking with more than 20 routes.

Chapter 21: Relay & Electronic Interlocking Page 461 of 535