Sub Station Fence Guideline

SUB STATION FENCE GUIDELINE

September 1, 2023 1 Comment

Indian Electricity Act, 1910 And Indian Electricity -Rules, 1956 RULE 68(b) Fence In the case of outdoor type of sub-station, a metallic fencing of not less than 1.8 meter height shall be erected around the transformer.

BS 1722-10:2019 

Fence Anti-intruder fences in chain link and welded mesh for anti-intruder chain link or welded mesh fences and gates of at least 2.4 meter in height for situations that require a higher level of protection

NEC 110.31 Enclosure for Electrical Installations

Fence A fence shall not be less than 2.1 meter (7 ft) in height or a combination of 1.8 meter (6 ft) or more of fence fabric and a 300 mm (1 ft) or more extension utilizing three or more strands of barbed wire or equivalent.

Rajasthan Rajya Vidyut Prasaran Nigam Limited

Fence Fencing and Gates shall be provided for Switchyard area as per General Electrical Layout Plan. The height of fence post shall be at least 3050 mm.

THE HARYANA BUILDING CODE, 2017

Fence Boundary wall up to the height of 2400mm may be permitted by the Competent Authority in electric sub-stations, transformer stations, industrial buildings (workshops, factories) , institutional buildings (hospitals ), educational buildings (schools, colleges, including hostels and other uses of public utility undertakings and strategically sensitive buildings.

Guide to the Safety, Health and Welfare at Work-IRELAND

Fence The transformer or switchgear is adequately protected either by suitable fencing not less than 2400MM high, or by some other effective means such as high walls or some other effective means for preventing any unauthorized person gaining access to the equipment or to anything connected there to which is used as a conductor unless it is completely enclosed by (i) a metal casing which is connected to earth, or (ii) some other equally suitable non-metal casing.

NATIONAL BUILDING CODE OF INDIA 2016

CLAUSE 4.6 (b)

Enclose any part of the substation which is open to the air, with a fence (earthed efficiently at both ends) or wall not less than 1 800 mm (preferably not less than 2400 mm) in height; to prevent, so far as is reasonably practicable, danger of electric shock or unauthorized access; CLAUSE 5.3.6.10

Electrical installations in a room or cubicle or in an area surrounded by wall fence, access to which is controlled by lock and key shall be considered accessible to authorized persons only. Such installations shall be efficiently protected by fencing not less than 1 800 mm in height or other means so as to prevent access to the electric supply lines and apparatus therein by an undesignated person and the fencing of such area shall be earthed efficiently.

NEC TABLE 110.31. MINIMUM DISTANCE FROM FENCE TO LIVE PARTS

NOMINAL VOLTAGE MINIMUM DISTANCE FROM LIVE PART 1KV TO 13.7KV 3.05 METER 13.8KV TO 23KV 4.57 METER OVER 23KV 5.49 METER

ESKOM TRANSMISSION SUBSTATIONS Table 1: Security and safety fences

Fence Fence Type IP spacing Strain Posts Spacing Security 2.4 Meter high, welded mesh fence 4.0m maximum 40m maximum where distance between corner posts exceed 90m Safety 1.8 Meter high, diamond mesh 4.5m maximum 60m maximum where distance between corner posts exceed 90m

Outdoor Transformer / Panel Fencing as per UGVCL

Fence Height 1600 MM (1500+100 mm) above ground and 450 mm in ground; minimum Width and Length as per site conditions and as decided by EIC (Engineer In-charge). Fencing Gate Fencing gate should have door with two shutters with one Heavy duty S.S. aldrop of size not less than 16 mm Día and 350 mm length. Gate is to be provided as per site conditions. Gate should be suitably stiffened to prevent sagging. 3nos. of Hinges of 100 mm size on each door and shall be of heavy duty S.S. and facilitate of outward 180 degree movement of the gate flaps. Left door of gate should be provided with stopper of 300 mm and Dia. of 10 mm at upper and lower part of fencing with proper locking arrangement. Grade of Material for Fencing Pultruded FRP – UV and Fire Resistant conforming to IS 6746 Bracing Flat SMC molded / FRP Flat 35 x5mm and length 300 mm Vertical Post (Pultruded FRP) The vertical post shall be made out of FRP Pultruded square hollow section of size 50x50x5 mm. Such posts shall be kept at a distance not exceeding 1000 mm and shall be grouted in the ground with c.c. of ratio 1:2:4 in the pit of size 300x300x450 mm Post should be buried in foundation at least 450 mm from ground level. Posts at corners and gate openings may be of different size/shape so as to take care of the fencing requirements Sub frame section FRP Box section of 50 x 25 x 5mm Rails Rails shall be made out of FRP notch bars of 12 mm dia. provided at equal spacing not exceeding200 mm Centre to Centre. The rails are placed horizontally and height of the 1st rail from the ground as well as gap between the rails sh…