Understanding the forms of segregation is crucial in the realm of electrical switchboard designs, playing a pivotal role in ensuring safety and efficiency. As someone who has navigated this intricate landscape during my tenure as a project engineer in a panel manufacturing setting, the significance of these forms became evident in the success of my project designs.

 


Photo Curtesy: Schneider Electric.

 

Let's delve into the essence of these forms. 

Forms of segregation are regulatory measures employed to partition an assembly, allowing access to specific parts while keeping other sections energized and operational. The primary purpose is to shield against contact with live parts of adjacent functional units and prevent the passage of solid foreign bodies between units.

 

The determination of the form to be used is influenced by the expertise of those involved, the required level of protection, and the maintenance needs. These forms enable the division of the panel into closed protected spaces, achieving key objectives:

 

Protection against Direct Contact: Form 1 requires no separation within the enclosure, while Forms 2a and 2b offer varying degrees of protection against accidental contact, with Form 2b providing additional safety for working on outgoing lines.

 

Isolation of Devices: Forms 3a and 3b isolate each device in a compartment, safeguarding against incidents on other devices. Form 3b combines features of Form 3a and Form 2b, separating output terminals and busbars.

 

Safety in Working on Outgoing Lines: Forms 4a and 4b elevate safety by isolating output terminals in the same compartment as the device. Form 4b goes a step further, ensuring maximum safety by separating all functions.

 

Standard EN 60439-1 outlines seven types of forms (1, 2a, 2b, 3a, 3b, 4a, and 4b). Each form serves specific purposes, addressing distinct safety and operational considerations.

 

In conclusion, a nuanced understanding of these forms is indispensable for professionals engaged in electrical switchboard design, aligning with stringent standards to guarantee both safety and operational efficacy.