(1)fully-sealed channel box of fire-proof type: the product suits the power cable below 10kv,
and also suits the control cable,lightening lines to be laid in the areial cable ditch and
channel indoors or outdoors.
(2)half-sealed channel box of the fire-proof type:the product can experience flame stifling
,temperature in the channel can be limited to be permitted value for the safety motion of cable
.The box cover is double board. Besides the function against rain, if can fall automatically
when temperature is high enough,covering the cooling hole to avoid air.
(3)fire rated channel box for cable tunnel:the product is widely-used for the tunnel, some
underground public facilies and some other occasions. it is ventilated. when the channel
box catches fire or the cable is hotter, the opened ventilated mesh soaked with special refractory
coating is blocked becuase of the flames, and also expanded to thick carbon bits covering
the cable,the small cover on the net falls automatically to cover the net face, as a result,
causing the burning medium to go out because of the absence of oxygen.
(4)Inorganic channel box of fire-proof type: the product is formed with the inorganic material
and strengthed glass fibre. the refractory structure is fully seally. it can prevent efficiently
the self-burning of the cable and the danger of the outer kindling material. becuase of inorganic
material, it is especially suitable for the occassions of serious acid and alkali corrosion.