Page 316 - IRSEM_Main Book

12.28.3 Testing and overhauling of Electrical Locking

(a) Mechanical interlocking frames provided with electrical signalling
equipment shall be tested and overhauled as per requirements contained
in paras.12.25.5 & 12.26.7.

(b) The testing of electrical locking shall be carried out in accordance with the
approved release circuit of each lever as shown on the approved diagram
of electrical circuits.

(c) For testing the electrical locking provided on a lever, the other levers
required to release that lever shall be pulled and it must be ensured that
the lever is free to be pulled mechanically.

(d) All the conditions for the release of the electrical lock of the lever under
test shall be set up. The lever shall now be pulled from normal to reverse
for testing of A&D locks and reverse to normal for E&B locks and proper
functioning of the lever locks checked.

(e) A test lamp/voltmeter shall now be connected on the electrical lock of the
lever under test. The lever shall now be pulled from normal to reverse and
vice versa. The test lamp should lit up at lock positions. The lever shall be
held at these positions one after the other and all the lock release
conditions shall be broken one by one. It shall be ensured that feed to the
lever lock is disconnected each time. While doing this test, care shall be
taken to test each circuit individually one after the other duly isolating
other parallel circuits.

12.28.4 Testing of other electrical equipment

(a) Instructions contained in Chapter 19 of SEM for testing of electrical
signalling installations shall also apply to electromechanical installations
wherever relevant.

(b) All electrical equipments such as electric lever locks, circuit controllers
etc. as well as wiring shall be examined and tested for insulation. The
insulation must not be less than 10 Mega Ohm. Defective equipments
shall be replaced.

(c) Moving parts of circuit controllers, their mechanical connections and
contact makers shall be checked. Repairs and replacements should be
carried out wherever necessary.

12.28.5 Date of last overhauling and testing

(a) Date of last overhauling and testing should be painted on the interlocking
frame.

12.28.6 Certificate of overhauling

(a) Locking overhauling certificate on Form S&T/LO (Annexure: 12-A2) for all
mechanical interlocking frames shall be promptly submitted by the
SSE/JE(Signal) to the Sr. DSTE/DSTE, who shall after necessary
scrutiny forward a consolidated certificate to the PCSTE.

Chapter 12: Installation, Testing & Maintenance of Mechanical Signalling Equipment Page 270 of 535