Thumb Rule-12 (Quick Reference of DG Set)

 

Standard Size of The DG sets

KVA KVA KVA KVA KVA
7.5 KVA 20KVA 35 KVA 62.5 KVA 100 KVA
10 KVA 25 KVA 40 KVA 75 KVA 125 KVA
15 KVA 30 KVA 50 KVA 82.5 KVA 200 KVA

 

D.G Foundation Bar Size

Rating of D.G set Size of Bar
Up to 82.5 KVA 10MM
100 KVA To 200 KVA 12MM
250 KVA to 500KVA 16MM

 

Minimum Capacity of  Fuel Service Tank

AS per CPWD
Capacity of DG set Minimum Fuel Tank Capacity
Upto 25 KVA 100 Liters
Above 25 to 62.5 KVA 120 Liters
Above 62.5 KVA to 125 KVA 225 Liters
Above 125 KVA to 200 KVA 285 Liters
Above 200 KVA to 380 KVA 500 Liters
Above 380 KVA to 500 KVA 700 Liters
Above 500 KVA to 750 KVA 900 Liters

 

Battery Size for D.G Set

                                                           AS per CPWD

DG Set Capacity Battery Capacity (AH) Cu Cable Size (Sq. mm) Electrical System (Volts)

Up to 25 KVA

88 35

12

Above 25 KVA upto 62.5 KVA

120 50

12

Above 62.5 KVA up to 82.5 KVA

150 50

12

Above 82.5.KVA up to 125 KVA

180 50

12

Above 125 KVA up to 500 KVA

180 70

12

Above 500 KVA

360 70

24

 

Depths of PCC (Plain Cement Concrete)  for DG Set

As per CPWD

DG Set Capacity (KVA) Typical Depth of PCC Foundation (For soil bearing capacity 5000 kg/sq meter)
750-2000 600 mm
625 400 mm
320-500 400 mm
200-320 400 mm
82.5 -200 400 mm
Upto 82.5 200 mm

 

Foundation & Earthing for D.G Set

As Per CPWD

Ieam Descriptions
D.G set inside Room A PCC foundation (1:2:4, M-20 grade) of approximate depth 150 mm above the finished Generator set Room Floor level
The  length  and  breadth  of  foundation  should  be  at  least  250  mm   more on all sides than the size of the enclosure.
D.G set in Open Room A PCC (1:2:4, M-20 grade) foundation  of  weight  2.5  times  the  operating  weight  of  the  Generator set  with  enclosure  or  as recommended by the Generator set manufacturer, whichever is higher
300 mm of this foundation height should be above the ground level. The length and breadth of foundation should be at least 250 mm more on all sides than the size of enclosure.
Earthing Copper plate earthing (Neutral Grounding) shall be provided for DG Sets of capacity 500 KVA or above
whereas G.I. plate earthing (Neutral Grounding) shall be provided for DG Sets below 500 KVA capacity. The body earthing shall generally be of G.I
Numbers of earthing for each DG Sets 2No’s  earthing sets for Genset/ control panel body.
2No’s earthing sets for neutral.
In case there are more than one DG Set in one location, independent two nos. neutral earthing shall be provided for each DG set. However, two nos. earthing sets shall be common for the body earthing of DG Sets
DG Set of 500 KVA capacity or above:- Copper strip
DG Set below 500 KVA capacity:- GI strip

 

D.G Detail according to Size

D.G Size (KVA) L x W x H (Canopy) mm Approx Weight (Kg) Fuel Tank (Ltrs) Fuel Consumption (Ltr/hr) Oil Consumption (Ltr/hr)
12.5 2040 x 1230 x 1450 1050 60 2.3 0.02
15 2040 x 1230 x 1450 1050 65 2.3 0.02
20 2240 x 1230 x 1450 1300 65 3.7 0.03
30 2510 x 1130 x 1450 1300 65 6.3 0.03
40 3350 x 1180 x 1650 1500 100 7.8 0.03
50 3350 x 1180 x 1650 1500 100 8.3 0.03
62.5 3350 x 1180 x 1650 1930 150 10.5 0.03
75 3605 x 1405 x 1600 1950 150 13 0.03
100 3940 x 1700 x 1850 2500 300 15.7 0.05
125 3950 x 1700 x 1850 2700 300 19 0.05
140 4600 x 1850 x 1950 3580 300 22.6 0.06
160 4600 x 1850 x 1950 3720 450 25.9 0.14
180 4970 x 1730 x 2045 3870 450 27.7 0.14
200 4970 x 1730 x 2045 3950 450 29.8 0.14
250 4970 x 1730 x 2050 4660 450 37.7 0.15
275 5700 x 2030 x 2515 5860 450 50 0.15
320 5700 x 2030 x 2515 5860 450 57 0.3
400 5905 x 2030 x 2520 6180 990 65.1 0.3
500 6205 x 2030 x 2550 6990 990 81.3 0.3

 

FUEL CONSUMPTION  FOR DG SET:

Generator KVA Diesel consumption Liter per hour
5 1.25
15 2.91
20 4.78
25 4.78
30 6.55
40 8.11
50 10.19
62.5 10.92
75 13.52
82.5 13.52
125 19.76
140 23.4
200 30.99

 

D.G Spacing Guidance

Description DG set with Acoustic Enclosure Open DG set in room.
in Open Area in Closed Area
Free space on both sides Min. 1.5 m Min. 1.5 m Min. 2 m
Free space at front side (Radiator Hot air outlet at Front) Min. 3 m Min. 3 m N/A
Free space at front side (Radiator Hot air outlet at Top) Min. 1.0 m Min. 1.5 m N/A
Free space at rear side
(Alternator)
Min. 2 m Min. 2 m Min. 2 m
Fresh air inlet opening area N/A N/A Min 1.5 times of the Radiator area.
Hot air discharge opening area N/A N/A Min 2.5 times of the Radiator area.
Distance between two sets Min 1.5 meter between two
canopies
Min 1.5 meter between
two canopies
Min 1.5 meter between two foundations.

 

About Jignesh.Parmar
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). He is member of Institution of Engineers (MIE) and CEng,India. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

12 Responses to Thumb Rule-12 (Quick Reference of DG Set)

  1. satish says:

    excellent info good work indeed

  2. Mahesh Bende says:

    Valuable information.

  3. R P Samal L&T says:

    So nicely presented even a layman can make use of it. Very very practical. Thanks

  4. Zahed says:

    Dear Jignesh sir
    Your work is awesome. It helps me in several way. Thank you very much. God bless you sir.

  5. Firdous Ansari says:

    excellent compilation

  6. Mohamed Akram Khan says:

    Thank you Eng. Jignesh for this very useful information on DGs. Could you please also elaborate on the selection of the circuit breakers since we have to take the generator’s subtransient reactance X”d (%) into account.
    Kind regards, Akram Khan

  7. Subhashini says:

    Jignesh sir,

    Thank you very much for notes on DG . It is very informative.

  8. MUKIL says:

    Sir,How to calculate cost of 1 unit when industry is powered by DG?
    And what are the parameters needs to be considered while calculating cost?

  9. Manmohan Prajapati says:

    Sir good morning mujhe electrical work ke Puri book leni he kese lu

  10. soniranjan mahapatra says:

    dear sir, M20 grade bonding ratio is 1:1.5:3 but you mentioned it as 1:2:4 which is M15 grade.

  11. premananth says:

    dear sir please upload what are the types and explain the details for transformer testing and cable testing

  12. Vivekanand Pandey says:

    Dear sir
    Kindly provide DG maintenance notes like pm DM CR Acheck B check C check also
    I highly obliged to you for this

    Regards
    Vivekanand pandey

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