Ex "ec" Motors 1

[NickParker]

Ex "e" Motors - The motor must be constructed in such way that under normal operation, no parts must produce arcs, sparks or high temperatures. The above mentioned conditions must not occur even at overload conditions.
What is the difference in Ex "e" Vs Ex "ec" motors? What does this extra "c" refers to? Any difference in construction?

 

[ScottyUK]

Ex 'ec' is the rebranded Ex 'n' which you're probably familiar with.
Ex 'e' is now Ex 'eb'

Ex 'eb' motors are suitable for use in a Zone 1 or Zone 2 environment. They must be protected with an overload certified for the purpose - a very quick curve, close to a Class 5 response, which isn't much use on a high inertia load.

Ex 'ec' motors are suitable for use only in a Zone 2 environment; they're pretty much a standard motor and can be used with the standard industrial overload protection relays.