Installation Manual

23
APPENDIX M:
SNOW MELT DIAGRAM 277V - TYPICAL LINE DIAGRAM (FOR 12 CIRCUITS/CABLES) WITH MANUAL CONTROL
277V CIRCUITS
120V
SWITCHED
POWER
Heater cable 50ft cold leads to be taken through
3/4” (19mm) rigid metal conduit back to J-boxes.
Installer may use more J-boxes
outside or inside building.
277V CIRCUITS
J-BOX
J-BOX
HEATER CABLE / MAT #1
HEATER CABLE / MAT #2
HEATER CABLE / MAT #3
HEATER CABLE / MAT #4
HEATER CABLE / MAT #5
HEATER CABLE / MAT #6
277 VAC
BREAKER PANEL
RLY-12PL
RELAY PANEL
OutsideInside
120 VAC
BREAKER PANEL
J-BOX
J-BOX
HEATER CABLE / MAT #7
HEATER CABLE / MAT #8
HEATER CABLE / MAT #9
HEATER CABLE / MAT #10
HEATER CABLE / MAT #11
HEATER CABLE / MAT #12
SCM-120
DIAL TIMER
CONTROLLER
120V
CONTROL
POWER
(conduit size as per installer / local code requirements)