King Electric SCM - Manual (Page 15)

15
Important
Be prepared to install a marker plate indicating the presence of SC/SCM in the slab.
This helps alert and avoid possible damage in the future. Install where clearly visi-
ble in each snow-melted area. A marker plate is placed flush with the pavers.
Step 8: Manually spread sand over the top of the cables and base so that no less
than 1-1/2 inches covers the top of the heating cables. Be careful not to use sharp
tools. Compact the sand as recommended by the paver supplier, being careful not
to uncover any of the SC/SCM cable/ mat and not to damage the conduits coming
into the slab area. Use hand compacting
tools around the conduit area. Add more
sand if necessary to maintain minimum 1-1/2 inches over all of the cables and
conduit.
Place the pavers over the top and finish as required.
SAVE THESE INSTRUCTIONS
INSTALLATION — PAVER / STONE
Stone or Paver Application
Step 1: Follow guidelines recommended by the paver manufacturer. If a coarse of sand is to be
applied over the gravel base, the cable/mat must first be secured in place and then covered with
a minimum 1-1/2 inch layer of to completely embed the mat.
Step 2A: (For SC Cable Installations) Secure plastic mounting cable ties to gravel base, driving
long nails or similar through the head of the cable tie. These cable ties should be applied at the
end of each run and at every 3—4 feet. Do not use metallic cable ties as they may damage the
cable. Lay out the cable and secure with the cable ties.
Step 2B: (For SCM Mat Installations) Begin laying out the mat and secure it onto the base with
landscape fabric stakes or similar over the mat tape every 2 feet or so. Make sure it is laid flat. Do
not use metallic stakes or staples directly over the heating cable. Be careful not to damage the heating cable.
Step 3: Use a digital multi-meter to measure the resistance between the conductors of the cable/mat power leads again. Record these re-
sistances in SC Cable / SCM Mat Testing Log under the section “Test Record # 2 After Installation”.
Step 4: Feed the power leads through the conduit into the junction box, leaving at least 6 inches of free lead length. Secure the heating cable
and splice so that they will not be pulled into the conduit. Insert a generous amount of electrical conduit sealant into the conduit end around the
power leads to prevent water entry.
Step 5: If a slab sensor is being installed, place the sensor socket according to the instructions. Secure and seal it to the conduit installed earli-
er. It should be located halfway between heating cables and in an area that is recommended by the sensor manufacturer. Make sure the top of
the sensor will be flush with the surface of the finish layer. Make sure it is protected with a cap or seal.
Step 6: Take a photo of the cable/mat installation. This can be very helpful later for utility work, changes to the site, eSC. to avoid possible
damage. Keep the photos with this installation manual.
Step 7: Before beginning work, inspect the cable/mat for damage and secure any cable/mat that may have come loose.
To avoid burying any damage that occurred since the mat was laid, the following tests should be preformed:
Use a digital multi-meter to measure the resistance between the conductors of the cable/mat power leads. If possible, your
electrician should perform an insulation resistance test on the cable/mat. A megohm meter adjusted to a minimum 1000 VDC
should give a measured value at least 20 megohm (MΩ).
! WARNING