IET logo
 
IET
Decrease font size
Increase font size
Topic Title: Atex rated chemical stores. Metal construction bonding questions.
Topic Summary:
Created On: 05 October 2017 06:21 PM
Status: Read Only
Linear : Threading : Single : Branch
 Atex rated chemical stores. Metal construction bonding questions.   - jamie8286 - 05 October 2017 06:21 PM  
 Atex rated chemical stores. Metal construction bonding questions.   - jamie8286 - 05 October 2017 08:26 PM  
Search Topic Search Topic
Topic Tools Topic Tools
View similar topics View similar topics
View topic in raw text format. Print this topic.
 05 October 2017 06:21 PM
User is offline View Users Profile Print this message



jamie8286

Posts: 15
Joined: 24 November 2013

Hi guys

Another metal container bonding question unfortunately.

We have two pre fab ATEX rated stores being delivered to site. One light fitting in each and an extract controlled via a control panel on the external face. ATEX installation / inspections will be completed when on site.

Supply to the cabin is TN-S. Cablin is located outside on a large inductrial site. Cabins can be simutanuesly touched. The stores are will be installed permanently however I am mindfull of section 717 mobile or transportable units. And also the fact the installation has been designed to Zone 2 incase a chemical spill occurs.

My intention is to protect the supply to each via seperate 30mA rcds as per section 717.

The question for me lies with bonding of the units. The units are in essence bonded through the steel work via the control panel which is bolted to the structure. There is also a 6 or 10mm bond coming from the panels onto the unit.

I am proposing to supplementary bond between the containers to lower any potential difference. However I am questioning if I should be asking our electrical contractor to install an additional 25mm main bonding conductor (Regulation 544.1.1) to the units given they could be seen as extraneous-conductive-parts. Or if supplementary bonds from the power supplys would be adequate.

I have been digging around on the forums but there appears to be no difinative answer on this. Any thoughts would be much appreaciated

Thanks
 05 October 2017 08:26 PM
User is offline View Users Profile Print this message



jamie8286

Posts: 15
Joined: 24 November 2013

Just to add I have seen a similar installations carried out in two different ways. Both on a TN-S supply and similar conditions.

One was installed with the 25mm bond and the other installed with an RCD with no bond to add to my confusion.

Thanks
Statistics

New here?


See Also:



FuseTalk Standard Edition v3.2 - © 1999-2017 FuseTalk Inc. All rights reserved.

..