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Gutters and roof drains

Gutters and roof drains. Snow and ice free roof gutters and eaves. Gutters. TXLP Cable from drum. G-Trace. Normally laid unattached, possibly fastened at the end. TXLP is placed double in gutter and drain. Spacers with arc facing up, approx. 3 per meter. G-Trace self limiting heating tape.

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Gutters and roof drains

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  1. Gutters and roof drains • Snow and ice free roof gutters and eaves

  2. Gutters • TXLP Cable from drum • G-Trace Normally laid unattached, possibly fastened at the end TXLP is placed double in gutter and drain Spacers with arc facing up, approx. 3 per meter • G-Trace self limiting heating tape • TXLP with spacer and fixing band

  3. Drain Be aware of possible sharp edges inside drains • Detail where cable continues on both sides of the drain Drain with spacer. Length of drain up to 35 m • Heating cable should be fastened in the outlet • At the top, provides best protection • At the bottom, prevents icing in the opening • Drain with suspension and spacer

  4. Heating cables on roofs • Detached heating cables on roofs should have an linear load between 16 - 18 W/m • Precautions must be taken to prevent damage on cable caused by the weight of snow • The cables might form grooves in tar roofing caused by the heat of the sun in the summer. An underlay of galvanized steel might be used • Heating cable in eaves • It is important that the heating cable forms a drip mould towards the roof gutter • An example of fastening method: • Strap to snow catcher

  5. Fixing band 10 368 45 Plastic spacer Code no. 10 368 19 Suspension bracket Code no. 10 368 25 Accessories

  6. Connection  Cold leads are attachet to the heating cable and led via a control system to a distribution board • The heating cable is connected by leading the leads through nipples in the drain pipe. The junction box is then placed lower on the wall. Placing the junction box lower on the wall is often used on tall buildings where it is practical to for supply connection from the basement or ground floor • Connection is made under the cornice by leading the leads of the heating cable behind the gutter and towards the junction box placed on the wall or the cornice

  7. Calculating gutter • OUTPUT: • Normal and maximum linear load per meter of gutter: • Normal Maximum • W/m W/m • Metal 40 50 • PVC 36 40 • Wood 30 36 • Calculate necessary cable length: • 2 x (l gutter + l drain) • Select resistance value in output diagram giving desired output per meter • Example: • l gutter + roof drain = 14,5 m • Cable length = 29 m • Metal • From diagram: • 29 m TXLP 2,5 ohm/m • 24 W/m cable = 48 W/m gutter • 700 W total output Load diagram 230 V Limit for concrete floor

  8. Calculating gutter • WWW.Nexans.no: • Enter total lengths of gutter and roof drain • Select correct material • PVC • Metal • Wood • The program will find cable and calculate outputs • Report for project documentation may be printed

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