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5 INSTALLATION
5.4 Protecting the MI Cable Terminations from
Hydrocarbon Flash Fires
While MI cable will continue to function when subjected
to fire, the terminations must be protected from the
fire. To maintain the functionality of the terminations
in installations where they may be exposed to a
hydrocarbon flash fire, protect the terminations with a
passive fireproofing system, such as a rigid / semi-rigid
enclosure, flexible enclosure, or intumescent coating
(such as K-MASS ® ) capable of withstanding the expected
temperatures. For other fire-rated applications where the
terminations must be protected, please contact nVent
Technical Support, see Section 1.1.
Note: Junction boxes, actuators, valves, etc. must be
protected as required by the customer specification.
In Figures 20 and 21 the junction box and valve actuator
are in the fire zone and are protected with intumescent
fireproofing material. In both cases, the MI cable gland
connectors (terminations) must be protected with a
similar fireproofing material at the points of entry into
the junction box and actuator. The intumescent material
protecting the gland connectors is formed to shape by the
manufacturer to completely cover the connector. Install
the protective fireproofing material in accordance with
the manufacturer's installation instructions. Seal all gaps
and joints around the fireproofing system with a suitable
fireproofing caulking.
28 | nVent.com
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