Legrand WC Cellular Raceway Systems - Manual (Page 4)

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Reinforced concrete design shall be in accordance with American Concrete Institute Specifications for Structural Concrete
for Buildings (ACI301-72) and ACI Building Code Requirements of Reinforced Concrete (ACI301-72) and ACI Building Code
Requirements for Reinforced Concrete (ACI318-83). Concrete placement shall follow proper and accepted industry practice
and be in accordance with ACI Recommended Practice for Measuring, Mixing, Transporting and Placing Concrete (ACI304-73).
Concrete must be vibrated at all headers, junction boxes, and raceways to insure that the concrete completely fills underneath the
Walkercell System. It is imperative that the concrete not be over vibrated. Over vibration causes segregation of materials in the
concrete mix which in turn leads to weakening of the concrete strength.
Wiremold strongly recommends the use of shrinkage and temperature reinforcement as a minimum reinforcement in slabs above the
Walkercell system. Design of shrinkage and temperature reinforcement should be in accordance with ACI318-83. Care should be
taken during concrete placement and, in particular, during concrete vibration, to prevent rising of top reinforcement in the slab.
Use of reinforcement in the top of the slab should greatly reduce cracking of the slab at the edges of the Walkercell System.
Hand troweled concrete finishing is required at all Walkercell System access openings.
Hand troweling is required 12 to 18 inches around the openings to provide a level finish with the cover plate. Concrete curing shall
follow proper and accepted industry practice and be in accordance with ACI301-72. Remove the Junction Box Cover Plates and
remove any moisture or condensation inside the raceway within 48 hours after the concrete pour. Severe damage can result to
the galvanized coating on the raceway if water is present and the inside of the raceway is deprived of freely moving air. The inside
of the raceway must remain dry at all times. Cover plates shall be cleaned of any excess moisture and concrete and reinstalled.
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