ATEX explosionproof circuit

[JimCasey]

I am wiring a couple of ASCO Explosion Proof (ATEX EExd IIC IP67) solenoid valves. Two valves are mounted so the conduit connections are on a tee, with the third leg of the tee connecting into an explosionproof switchbox on a ball valve actuator.

My question is: Do I need to use sealed cable glands on all three legs of the tee? Or is one cable gland on the connection to the limit switch assembly code-compliant?

 

[ScottyUK]

If it is in gas group IIC it requires a barrier gland.

If it is in Zone 1 with gas group IIA or IIB AND has an internal volume greater than 2 litres then it requires a barrier gland.

Otherwise a suitable flameproof gland with a sealing ring can be used.

Refer to EEMUA Publication 186 for some guidance - a useful document to have.


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