Typical Problems Encounted During Ex i Inspection
Published
Read Time: 5 mins
Throughout any inspection campaign non-compliant issues are going to be found. Here are some common issues we have found whilst conducting inspections on Intrinsically Safe equipment
- Incorrect Zone (Zones 1 and 2 for Ex ib; Zones 0, 1 and 2 for Ex ia)
- Incorrect Group for hazardous area classification Incorrect
- Temperature Classification for hazardous area classification
- Incorrect ambient temperature range for environment
- Documentation missing or incorrect
- Certificate of Conformity not read
- Labels missing or not illegible
- No separation of IS and Non-IS circuits
- Entity calculations not checked correctly or incorrect values used
- Barriers swapped out and IS calculations not re-checked
- No dedicated IS earth/bar
- Earthing missing from Galvanic / Zener barriers
- Uncertified or incorrectly certified barriers installed in the hazardous area and no Conformity Assessment Document
- Screens not earthed at one end (preferable in the Non hazardous area) and not secured in terminals in the hazardous area
What others can you think of?
This material is produced by HAZ. The information is of a general nature only and should not be relied upon. Each set of
circumstances associated with compliance of hazardous
areas and Type
B compliance
is unique and expert advice on your particular circumstances should be sought. HAZ accepts no liability for any reliance on the
information published on this website.