Gutters and roof drains

Snow and ice free roof gutters and eaves

Gutters

•TXLP with spacer and fixing band

•TXLP Cable from drum

Spacers with arc facing up, approx. 3 per meter

TXLP is placed double in gutter and drain

Normally laid unattached, possibly fastened at the end

•G-Trace self limiting heating tape

•G-Trace

Drain

•Detail where cable continues on both sides of the drain

•Drain with suspension and spacer

•Heating cable should be fastened in the outlet

•At the top, provides best protection•At the bottom, prevents icing in the opening

Drain with spacer. Length of drain up to 35 m

Be aware of possible sharp edges inside drains

Heating cables on roofs

•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

•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

Accessories

Fixing band10 368 45

Plastic spacerCode no. 10 368 19

Suspension bracketCode no. 10 368 25

Connection

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

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

Cold leads are attachet to the heating cable and led via a control system to a distribution board

Calculating gutter

OUTPUT:Normal and maximum linear load per meter of gutter:

Normal MaximumW/m W/m

Metal 40 50PVC 36 40Wood 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

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