Fire Escape Snow Melting
All exposed metal stairways/walkways shall be ﬁtted with an energy efﬁcient, self-regulating, stairway heating system, using Raychem FS-C-2X, as manufactured by Pentair Thermal Controls, to prevent impeded exit in winter.
The metal stairways shall consist of solid tread. The self-regulating heating cable shall be installed to a maximum circuit length of 90 metres, strictly in accordance with the manufacturer’s instructions and preferably by a specialist installer named by them, using two runs of heating cable per stair tread afﬁxed using aluminium tape at 150 mm spacing to the underside of each stair tread insulated (K factor 0.03 to 0.04 K/mK at 10°C) and sealed to prevent water ingress. The commissioning report must be registered to gain beneﬁt from the 5 year product warranty.
The stairway heating circuits shall be switched via a contactor and be protected with an MCB (BS EN 60898 type C or D or equivalent) and RCD (30 mA sensitivity, tripping within 100 ms). Isolators shall be provided for each circuit.