Increased Safety Exe

Question 1

What is Exe?

Answer 1

Relies on constructional safeguards to ensure that the apparatus does not normally contain arcing or sparking devices or hot surfaces that might cause ignition

Question 2

‘Rules’ for Exe?

4

Answer 2

Suitable for zones 1 and 2
Live maintenance not permitted
Minimum IP54 to be maintained
No unauthorised modification permitted

Question 3

What is creepage distance?

Answer 3

The shortest distance along the surface of an insulating material between to conductive parts

Question 4

What is clearance distance?

Answer 4

The shortest distance in air between two electrically conducting parts

Question 5

Luminaires in Exe MUST…

Answer 5

Luminaires with fluorescent lamps or electronic ballasts shall not be used where temperature class t5 or t6 is required or where the ambient temperature exceeds 60

Question 6

What requirements do a motor Exe need?

Answer 6

An inverse-time delay overload protective device is needed. It will monitor the motor current and also disconnect a stalled motor within time stated on the marking plate.
Should be less than 5 seconds