King Electric SCM - Manual (Page 16)

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Stone or Paver Application continued:
Important Make sure the heating cable is fully embedded as well as 2 to 6 inches of the conduits enclosing the power lead and slab
sensor wiring (if used).
It is highly recommended that pavers be no more that 2-1/2 inches thick.
Step 9: Use a digital multi-meter to measure the resistance between the conductors of the mat/cable power leads again. Record the results in
SC Cable / SCM Mat Testing Log under the section “Test Record # 3 After Covering Is Applied”.
Ceramic or Stone Tile Application
Step 1: SX mats or cables can be installed in the structural slab or in a thick mortar bed above a
structural slab. In either case, the base material should be prepared according to section 7.12.1
Concrete Application.
Step 2A: (For SX 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 2B: (For SX Cable Installations) Secure plastic mounting cable ties to the 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 to 4 feet. Do not use metallic cable ties as they may dam-
age the cable.
Lay out the cable and secure with the cable ties.
Step 3: Use a digital multi-meter to measure the resistance between the conductors of the mat/cable 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
earlier. 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 mat/cable installation. This can be very helpful later for utility work, changes to the site, etc. to avoid possible
damage. Keep the photos with this installation manual.
Step 7: Before beginning work, inspect the mat/cable for damage and secure any mat/cable that may have come loose.
To avoid burying any possible damage that may have occurred since the mat was laid, the following tests should be performed:
Use a digital multi-meter to measure the resistance between the conductors of the mat/cable power leads again (see
Step 7.7). If possible, your electrician should perform an insulation resistance test on the mat/cable. A megohmeter adjusted to a minimum
1000 VDC should give a measured value at least 20 megohm (M
Ω).
Important
Be prepared to install a marker plate or other identification indicating the presence of SX in the slab. This helps alert and avoid possible dam-
age from future on-site. Install a marker plate where clearly visible in each snow-melted area. A marker plate is placed flush in the wet con-
crete surface or soft asphalt surface. Other types of surfaces should be made to allow the marker plate to be installed flush with the surface.
Do not damage the heating cable.
SAVE THESE INSTRUCTIONS
INSTALLATION — TILE
KING ELECTRIC MFG CO · 9131 10TH AVENUE SOUTH · SEATTLE, WA 98108 · PH:206 762 0400 · FAX: 206 763 7738 · www.king-electric.com