intrinsic relays

[bergie]

heres one for the master sparkies;
i want to convert a machine for a zoned area.its a few motors that can be changed to exd motors and some limit/level switches.my question is: can i install an intrinsic relay in the safe area to monitor the switch,without changing the switch to an ex rated switch.
if it must be replaced then i wouldnt need the intrinsic relay in the first place.

[murdock]

you can use an intrisically safe relay but the relay cannot be in the zoned area...if it is located in the zoned area must be enclosed in a suitable enclosure.

i did a job in cape town where our controls panel was mounted in a zoned area...so we had to install a panel which weighed about 400 kg and had a about 30 screws to hold the front cover.

[bergie]

hi murdock the relay will be in the safe area,but i see there are some other dis.boards in zone 2, but protected by purging and others with lel sensors.
i am leaving the selection of the level switches to the consultants. they can sort out the zoning and loop diagrams,etc