Utilities Flyer V1.4 - Flipbook - Page 21
LAYERING GUIDE & HRC HAZARD RISK CATEGORIES
UNDERSTANDING TEST METHODS & RESULTS
There are Test Methods and Test Results for ARC Flash Clothing.
Here we provide a basic overview of the methods used for HAZTEC
Workwear and the resulting data.
ABOUT LAYERING
There are Test Methods and Test Results for ARC Flash Clothing.
Here we provide a basic overview of the methods used for HAZTEC
Workwear and the resulting data.
BOX TEST METHOD
When garments are tested using the Box Test method an ARC rating
of either Class 1 or Class 2 is achieved.
Adding a Class 1 garment with another class 1 garment does not
necessarily give you a Class 2 rating and the combined result can only
be confirmed when the garments are tested together.
WEARING OF NON-ARC CERTIFIED GARMENTS
WITH YOUR ARC GARMENTS
OUTER LAYERS
It is important to remember that the outermost layer of your protective
clothing must be FR and ARC rated. To add a non-FR layer over your
ARC rated garments defeats the whole purpose of wearing ARC
rated garments – if that outer layer was to ignite, the heat can transfer
through your inner ARC garments to your body.
INNER LAYERS
Wearing non-ARC rated garments beneath your ARC rated garments
can also be the cause of serious burn injuries. We recommend that
if non-ARC rated undergarments are worn that these are natural
non-melting fibres e.g. 100% cotton. Polyester type fibres or similar
fabrics that can melt should not be worn if there is a flame, heat or
ARC hazard present in your workplace as this can cause serious burn
injuries.
OPEN ARC METHOD
ATPV or EBT ratings - when garments are tested using this method
a rating per garment is achieved. When worn in combination with
other garments, these ratings can be added together (as a guide to
some degree) but the total protective value of the combination is only
known when the garments are tested as a combined set.
Outer Layer
(JACKET,
9,6cal/cm2)
Mid Layer
(POLO SHIRT,
4,6cal/cm2)
Base Layer
(BASELAYER,
6 cal/cm2)
GAPS BETWEEN YOUR GARMENTS
ALLOW AIR FLOW BETWEEN LAYERS
Total
34,0cal/cm2
*figures shown are indicative
Aberdeen: +44 (0)1224 707468
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