The switch board room drawing shall carry a little block showing name of project, name and address of developer and architect and endorsed by registered Consultant / Contractor responsible for planning, design and supervision of the installation work.
Minimum clearance requirements for purpose of safety and effectively operating and adjusting all equipment mounted on the main switch board (MSB) are as follows :-
The switch board room shall preferably be provided with an alternative emergency exit door.
The door shall be arranged to be opened outwards and shall not obstruct a passageway into which open. All doors shall be fitted with locks to prevent the entry of unauthorized persons, but shall be readily opened from the inside without the use of a key. Sliding door is acceptable.
The switch board room shall either be naturally or forced ventilated depending on location. Forced ventilation shall be required if the switch board room is located at basement levels where ducted fresh air and exhaust are to be maintained effectively. The exhaust fan shall be of adequate capacity and shall be controlled by a timer.
Trenches, cable trays and cable entry duct/pipes where required for services to and from the switch board room are to be provided
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Showing posts with label Substations. Show all posts
Showing posts with label Substations. Show all posts
Requirements of Outdoor substations Part - 2
Floor opening of 760 mm x 760 mm leading to basement where required, are to be provided with an appropriate galvanized chequer cover. Cat ladders are to be provided at floor openings. Details of these must be shown on drawings.
Basement where required must be at least 1.8 m clear height and its floor level must be equal to higher than the surrounding final main road level.
Basement door (if applicable) shall be fixed with a panic bolt of the approved type.
Positions and details of plant and cable duct opening s as shown on drawing are subject to verification on site.
Cable trenches, ramps and cable entry ducts are to be supported by pilling where necessary. Cross sectional views must be shown on drawing.
Cable trenches of a minimum depth 900 mm and a minimum width of 600 mm are to be provided. The trenches are to be filled with sand.
Cable trenches and switch gear floor openings are to be covered with removable galvanized chequer plate each of 8 mm thickness and 300 mm width.
All cable trenches and substation basement (if applicable) must be dry and free of water. Water proof sealing compound shall be used.
The value of the minimum bending radius of the various types of cables shall be complied with.
The schematic layout of the light fittings, power points, etc shall be shown in the drawing.
An illumination level of above 400 lux is required. External lighting for substation building shall be controlled by a time switch.
A minimum of 2 numbers of switched power socket putlets each are required for the transformer and switch gear rooms.
All substation wiring shall be run in surfaced G.I. conduits.
A rubber mat to B.S. 5912/1952 or equivalent, of minimum thickness of 5 mm and width 600 mm shall be provided in front of the switch gear.
Fire fighting requirements shall be approved by the Fire Department as well as SESCO are as follow :-
A. For up to 1000 kVA capacity, 1 unit each of CO2 fire extinguisher of the approved type is to be provided and mounted in transformer, switch gear and battery room.
B. For greater than 1000 kVA capacity, a CO2 gas fire fighting system of adequate capacity with smoke and heat detectors are to be installed in the transformer and switch gear
Switch gear room and transformer room must be designed to provide adequate ventilation. Honeycomb walls or p.c. RC louvers, where applicable, are to be used for transformer capacities up to 1000 kVA.
For substation above 1000 kVA capacity, a time controlled exhaust fan of adequate capacity is to be installed separately in both transformer and switch gear rooms.
Substation name plate and danger sign are to be mounted at the substation door
The substations shall be earth filled to a height of at least 300 mm above the final flood level or above the height of the surrounding area.
The substation fencing shall be as follows :-
(A) Chain link perimeter fencing of 3 m height shall be galvanized to B.S.729 and B.S.443 inclusive of 3 rows of barbed wire at the fence top.
(B) The base of the fencing shall be embedded in a concrete kerb of 150 mm depth and 100 mm width.
(C) All metal structures which from the fencing shall be separately earthed.
(D) An apron of minimum 600 mm shall be provided surrounding the perimeter fence externally.
Basement where required must be at least 1.8 m clear height and its floor level must be equal to higher than the surrounding final main road level.
Basement door (if applicable) shall be fixed with a panic bolt of the approved type.
Positions and details of plant and cable duct opening s as shown on drawing are subject to verification on site.
Cable trenches, ramps and cable entry ducts are to be supported by pilling where necessary. Cross sectional views must be shown on drawing.
Cable trenches of a minimum depth 900 mm and a minimum width of 600 mm are to be provided. The trenches are to be filled with sand.
Cable trenches and switch gear floor openings are to be covered with removable galvanized chequer plate each of 8 mm thickness and 300 mm width.
All cable trenches and substation basement (if applicable) must be dry and free of water. Water proof sealing compound shall be used.
The value of the minimum bending radius of the various types of cables shall be complied with.
The schematic layout of the light fittings, power points, etc shall be shown in the drawing.
An illumination level of above 400 lux is required. External lighting for substation building shall be controlled by a time switch.
A minimum of 2 numbers of switched power socket putlets each are required for the transformer and switch gear rooms.
All substation wiring shall be run in surfaced G.I. conduits.
A rubber mat to B.S. 5912/1952 or equivalent, of minimum thickness of 5 mm and width 600 mm shall be provided in front of the switch gear.
Fire fighting requirements shall be approved by the Fire Department as well as SESCO are as follow :-
A. For up to 1000 kVA capacity, 1 unit each of CO2 fire extinguisher of the approved type is to be provided and mounted in transformer, switch gear and battery room.
B. For greater than 1000 kVA capacity, a CO2 gas fire fighting system of adequate capacity with smoke and heat detectors are to be installed in the transformer and switch gear
Switch gear room and transformer room must be designed to provide adequate ventilation. Honeycomb walls or p.c. RC louvers, where applicable, are to be used for transformer capacities up to 1000 kVA.
For substation above 1000 kVA capacity, a time controlled exhaust fan of adequate capacity is to be installed separately in both transformer and switch gear rooms.
Substation name plate and danger sign are to be mounted at the substation door
The substations shall be earth filled to a height of at least 300 mm above the final flood level or above the height of the surrounding area.
The substation fencing shall be as follows :-
(A) Chain link perimeter fencing of 3 m height shall be galvanized to B.S.729 and B.S.443 inclusive of 3 rows of barbed wire at the fence top.
(B) The base of the fencing shall be embedded in a concrete kerb of 150 mm depth and 100 mm width.
(C) All metal structures which from the fencing shall be separately earthed.
(D) An apron of minimum 600 mm shall be provided surrounding the perimeter fence externally.
Requirement for Indoor Substation Part - 1
The substations drawing shall carry a title block showing name of project, name and address of developer and architect and endorsed by the registered consultant/contractor responsible for the planning, design and supervision of the installation work.
All dimensions and figures shown on plans are to be shown in the metric system and are to be taken as checked by Consultant / Contractor.
The substation roof shall be of spandek roofing laid to proper falls and with water-proofing materials. Galvanized iron rainwater pipes from roof are to be brought right down to surrounding drains.
All internal walls and columns are to be provided with 20 mm cement plastering, and emulsion-painted. The ceiling shall be made of fire-rated materials of the approved type and is to be emulsion painted as well.
All wood work, metal work, etc are to be suitably painted; all woodwork shall be anti-termite treated. The external wall shall be painted with weather shielded paint or equivalent.
Door shall be made of aluminium roller / sliding doors and provided with bolting requirements for locks. Minimum dimensions are :
Switch gear room = 2700mm x 1800mm W (Nett)
Transformer room = 2700mm x 2700mm W (Nett)
Hasp and staple (125mm x 50mm x 5mm) shall be of the brass type and door hinges (125mm x 90mm x 3mm) shall be of the stainless steel type.
Transformer and switch gear are to be housed in separate rooms with brick walling of at least 225mm thickness.
Should there be more than one transformer to be installed, the individual transformers are to be separated by either:
A minimum distance of at least 1.5 m or,
2.5 m high brick walling of at least 225 mm thickness.
The battery room, where required, shall be housed in a separate room; the minimum floor area shall be 2 m x 2 m.Adequate ventilation is to be provided.
Substation floor are to be of a 50mm thick cement rendering including a 20mm granolithic smooth finish of one part of cement to one part of granite chipping and one part of sand with an addition of 9 kg of ironite to each 45 kg of cement.
Switch gear floors are to take a load of 1.000 kg per square meter.
The engineer in-charge shall be notified prior to the final rendering of the substation (wherever applicable)
Clearance requirements are from sides and rear of switch gear shall be at least 1.0 meter and front clearance shall be either :-
The length of the fully with drawn circuit breaker truck plus an additional minimum length of 1.0 m.
A minimum length of 2.0 m.
Clearance from the top edge of the switch gear to the ceiling shall be at least 900 mm or greater.
Transformer plinth shall be of a minimum area 1.2 m square and shall be able to take a load of 10 tonnes. Side clearances to wall of 1 m are required around the transformer to be installed
All dimensions and figures shown on plans are to be shown in the metric system and are to be taken as checked by Consultant / Contractor.
The substation roof shall be of spandek roofing laid to proper falls and with water-proofing materials. Galvanized iron rainwater pipes from roof are to be brought right down to surrounding drains.
All internal walls and columns are to be provided with 20 mm cement plastering, and emulsion-painted. The ceiling shall be made of fire-rated materials of the approved type and is to be emulsion painted as well.
All wood work, metal work, etc are to be suitably painted; all woodwork shall be anti-termite treated. The external wall shall be painted with weather shielded paint or equivalent.
Door shall be made of aluminium roller / sliding doors and provided with bolting requirements for locks. Minimum dimensions are :
Switch gear room = 2700mm x 1800mm W (Nett)
Transformer room = 2700mm x 2700mm W (Nett)
Hasp and staple (125mm x 50mm x 5mm) shall be of the brass type and door hinges (125mm x 90mm x 3mm) shall be of the stainless steel type.
Transformer and switch gear are to be housed in separate rooms with brick walling of at least 225mm thickness.
Should there be more than one transformer to be installed, the individual transformers are to be separated by either:
A minimum distance of at least 1.5 m or,
2.5 m high brick walling of at least 225 mm thickness.
The battery room, where required, shall be housed in a separate room; the minimum floor area shall be 2 m x 2 m.Adequate ventilation is to be provided.
Substation floor are to be of a 50mm thick cement rendering including a 20mm granolithic smooth finish of one part of cement to one part of granite chipping and one part of sand with an addition of 9 kg of ironite to each 45 kg of cement.
Switch gear floors are to take a load of 1.000 kg per square meter.
The engineer in-charge shall be notified prior to the final rendering of the substation (wherever applicable)
Clearance requirements are from sides and rear of switch gear shall be at least 1.0 meter and front clearance shall be either :-
The length of the fully with drawn circuit breaker truck plus an additional minimum length of 1.0 m.
A minimum length of 2.0 m.
Clearance from the top edge of the switch gear to the ceiling shall be at least 900 mm or greater.
Transformer plinth shall be of a minimum area 1.2 m square and shall be able to take a load of 10 tonnes. Side clearances to wall of 1 m are required around the transformer to be installed
General Requirements substations
1. The substations must be accessible to authorized personnel and vehicles at all time.
2. The proposed access road to the substation entrance shall be built to withstand heavy vehicles with a total weight of about 10 tons.
3. The substation and access roads shall be located at least 300 mm above the final flood level of surrounding area.
4. Proper drainage around the substation is to be provided.
2. The proposed access road to the substation entrance shall be built to withstand heavy vehicles with a total weight of about 10 tons.
3. The substation and access roads shall be located at least 300 mm above the final flood level of surrounding area.
4. Proper drainage around the substation is to be provided.
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