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TitleGenerators in development projects
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Page 2

Generators in development projects

How to choose, size, install and use diesel generators


Second Edition.
April 2014.

Santiago Arnalich

Page 64

CHAPTER 3. Selection and purchase 63 Training and Consultancy for Development Aid

Manual cord start-up systems are installed in very low power generators and

compressed air systems are often more convenient for more powerful generators than

those considered in this book. Start up by battery is better known and more common.

Due to the draconian rules of some applications, some generators specify a 10 second

start, a cold load and other applications that can greatly complicate and increase the

expense of the installation.

If the start-up is simple, consider if a key is necessary or whether a switch is enough.

Remote starting or the automatic power failure starting function require accessories

that must be ordered.

Generators with cabin
Options: IP Grade protection, acoustic protection, material.

The cabin is primarily used to protect the generator from the elements in a compact

manner and/or to reduce noise, but does not retain the heat for long. In conditions

where corrosion is expected the cabins need to be made of aluminum. A generator

with cabin a should not be installed within an enclosed building to avoid excessive

restrictions of air flows.

Fig. 3.2 Pramac GBW22 generator with cabin.

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64 Generators in development projects.

© Santiago Arnalich Arnalich. Water and habitat

Fig. 3.3 Pramac GBW22 generator with cabin opened for maintenance.

Noise measurements will typically be given in decibels at a distance of 7 m. In Chapter

4, noise is described in more detail.

The cabin protection is measured with the IP standard, e.g. IP32. The first digit is

protection against the entry of solids and the second against water.

IP Entry of solids and objects Entry of líquids

0 No protection No protection

1 Foreign bodies with a diameter >50mm Vertical drops

2 Foreign bodies with a diameter >12mm Dripping water when tilted up to 15°
3 Foreign bodies with a diameter >2.5mm Water spray (up to 60 ° from vertical)
4 Foreign bodies with a diameter >1mm Water spray
5 Contact and dust deposits on the inside Water jets (from all directions)
6 Contact and dust penetration Accidental water injection
7 N/A Temporary immersion
8 N/A Indefinite immersion
9 N/A Pressure injection of water (80-100 bar)

Fig. 3.4 IP code breakdown chart.

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