ASTM E1725 Fire Resistive Barrier Test Question
ASTM E1725 Fire Resistive Barrier Test Question
(OP)
Why does ASTM E1725 consider a failure to occur when the average test temperatures exceed 139°C? It seems to me that the majority of low temperature cables have a maximum operating temperature of 90°C or 105°C?






RE: ASTM E1725 Fire Resistive Barrier Test Question
The rated temperature of normal PVC is 70 Co .Special PVC may withstand 105 Co. XLPE or EPR withstand 90 Co for indefinite time.
For a short time PVC may withstand 150 and XLPE 250 Co.
Never the less, I think the purpose of the temperature limits in this standard are not in order to assure ability of the insulation to be ready to be returned into operation but to avoid to set fire to other insulating material as paper [or similar] or elastomers with low fire resistance [ in contact or in vicinity of these wire].
Regards