Volume-II of IV - GAIL

MECON LIMITED
REGD. OFF : RANCHI (BIHAR)
Document6
PROCESS & PIPING
DESIGN SECTION
NEW DELHI
TITLE MAINLINE CONSTRUCTION
(ONSHORE)
STANDARD SPECIFICATION
SPECIFICATION NO. PAGE 7 OF 53
MEC/S/05/62/01 REVISION A
3.1.2.2 Measures must be taken to prevent excavating and hoisting equipments
from approaching high voltage lines to within any of the following distances.
This distance depends on the voltage carried. For individual connections the
distance must be :
0 - 50 KV 3m
40 - 200 KV 5m
200 - 380 KV 8m
The measures taken may be as follows :
1. Special selection of equipment, or limiting or blocking certain directions of
movement, or limiting the operational area, thereby making it impossible
for any work to tbe done at a distance from the high voltage line of less
than the accepted minimum.
2. In case the measures recommended in 1. above are not feasible,
installation of clearly visible markers of sufficient height or laying out a "no
passage beyond this point" line of drums painted bright red and white
must prevent any work being done inside the danger area. Further, an
inspector must be prevent all the time.
3.1.2.3 In the event that a vehicle, crane etc. should accidently come into contact
with a live cable of a high voltage system or flash-over of electrical charge
occurs, the driver must not leave his vehicle because this will pose a serious
threat to his life.
The vehicle or crane must break the contact WITHOUT ANY HELP FROM
OUTSIDE.
The driver must not leave his vehicle unitl be has managed to leave "the
dangerous area, or alternatively, when the Electricity Authorities have given
notice that the cable(s) have been put out of circuit. In case a serious fire starts
in the vehicle, he is permitted to jump from the vehicle, clearing it as far as
possible, while the jump should possible be to a dry spot.