Practical Assessments in 2391 Course In 2391 city and guilds examination there are four practical assessments covering inspection, Testing and certification of electrical installations. 2391 course prepare students to appear for these practical assessment sessions with confidence. As these courses are intended to people who are already in the field of electrical installations these are not too difficult to grasp. These practices are similar to ones done for the preparation of students for the Part P courses hence they are useful for those who try to go for part p courses. Since both will give an in depth knowledge about electrical installation they are very useful.