King Electric SCM - Manual (Page 7)

7 KING ELECTRIC MFG CO · 9131 10TH AVENUE SOUTH · SEATTLE, WA 98108 · PH:206 762 0400 · FAX: 206 763 7738 · www.king-electric.com
SAVE THESE INSTRUCTIONS
INSTALLATION INSTRUCTIONS
DANGER
! !
ELECTRIC SHOCK OR FIRE HAZARD
READ ALL WIRE SIZING, VOLTAGE REQUIREMENTS AND SAFETY
DATA TO AVOID PROPERTY DAMAGE AND PERSONAL INJURY
INSTALLATION
Select the Cable (s) or Mat (s) you need
WATTAGE
Decide what heat output is required. Your design must consider weather conditions and how critical it is to clear the heated area.
 50 watts per square foot: sufficient to clear most moderate and heavy snowfall rates.
 35 watts per square foot: sufficient to clear most light to moderate snowfall rates.
SIZE
Select a cable or mat to fit the heated area measured in on Page 6. Cable/Mat are manufactured in a variety of sizes. If the exact size of cable or
mat is not available, select the next smaller cable size.
AMPS and VOLTS
Pay careful attention to the amps to make sure your controls, circuit breaker panel, and all wiring will have the proper capacity. Design circuit
protection and wiring to handle 125 percent of heating cable load:
 20 amp circuit for load up to 16 amps
 30 amp circuit for load up to 24 amps
 40 amp circuit for load up to 32 amps
 50 amp circuit for load up to 40 amps
 70 amp cricuit for load up to 50 amps
Consult with your electrician to make sure the mats/cables, control, and design you have selected will work properly
 The SC/SCM cable/mat and its control must be placed on a dedicated power supply from the circuit breaker panel.
 The SC/SCM cable/mat is resistance heating system and should be considered as a continuous load for branch circuit sizing purposes.
 The circuit breaker must open all ungrounded conductors at the same time. A GFCI type (typically Class B, 30 mA trip) is required to directly
protect the SC/SCM cable and mat.
 Circuit breaker size and circuit wiring should be designed to 125 percent of heating mat load:
 20 amp circuit for load up to 16 amps
 30 amp circuit for load up to 24 amps
 40 amp circuit for load up to 32 amps
 50 amp circuit for load up to 40 amps
 70 amp circuit for load up to 50 amps
 Follow NEC, CEC, and local code guidelines for branch circuit wiring, conduit, and junction box installations. Outdoor and underground junc-
tion boxes and conduit must meet rain tight or watertight requirements as required.