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Page 

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 of 

HD140401-1 Rev 2 

Part No. DREX0074 

 

 

Installation Instructions 

CMH-CON

 

CMH

 - Connect

 

 

 

 

These installation instructions are only for use with the following 
Drexan HeatTracer Self-Regulating heater products: PipeGuard® CMH 

This kit may be installed in temperatures as low as -40°F/-40°C. 

 

  

WARNING

: This is an electrical device and in order to ensure proper operation and prevent shock or fire it must 

be installed correctly. Read these important warnings. Follow all installation instructions. 

CAUTION

: Ground-fault equipment protection must be used to minimize the danger of fire from sustained electrical 

arcing if the heating cable is damaged or improperly installed and to comply with Drexan requirements, agency 
certifications and national electrical codes. Conventional circuit breakers may not stop arcing. The metal sheath of 
CMH heating cable shall be grounded, but shall not be used as the grounding means. 

Metallic structures or materials such as metal pipes used to support CMH cable shall be grounded. 

CMH Cable is not to cross or come in contact with itself. 

CMH heating cables are to be thermostatically controlled. 

Component approvals and performance characteristics are based on Drexan specific parts only.           

Substitution will void approvals and performance claims. 

Component and heating cable ends must be kept dry before and during installation. 

Fire resistant thermal insulation should be used. 

CMH cable may be terminated or spliced in any certified enclosure mounted off the heated surface. 

 

APPROVALS

 

 

Class I, Div. 1/2, Groups A, B, C, D 
Class II, Div. 1/2, Groups E, F, G 
Class III 

    

231572 

       

 

120 – 277 Volt. 30 W/ft. max., Maximum withstand temperature 450˚C power off 

 

Drexan Energy Systems, Inc. 

Kelowna, BC, Canada, V4V 1S5 

 

Summary of Contents for CMH-CON

Page 1: ...des Conventional circuit breakers may not stop arcing The metal sheath of CMH heating cable shall be grounded but shall not be used as the grounding means Metallic structures or materials such as metal pipes used to support CMH cable shall be grounded CMH Cable is not to cross or come in contact with itself CMH heating cables are to be thermostatically controlled Component approvals and performanc...

Page 2: ...al insulation is installed on the pipe ensure the megger reading is 5 MOhm or higher Note CMH Cable is a zone type cable Refer to CMH Cable Reference Chart at the back of these instructions 2 Using a hacksaw cut the desired length of CMH cable allowing an extra three 3 feet 1 m per end and appropriate cable length for heat sinks such as valves flanges and pipe supports 3 Using a CMH Stripping Tool...

Page 3: ...eath and serves as a 10 25 4 cm cold lead 7 Slide the cable connector washer and grommet onto the cable sheath 8 Position the boot over the bus wires close to the sheath Apply silicone sealant inside the boot and around the cable sheath 13 mm from the end of the sheath Important after installing the boot megger the cable between the sheath and conductors to ensure the heater element is isolated fr...

Page 4: ...eting the termination install megger the cable between the sheath and conductors to ensure the heater element is isolated from the sheath The insulation resistance reading should be 5 MOhm or higher 13 Push the supplied silicone boots onto the conductors 14 Install into an approved enclosure 15 Thread the cable connector strain relief into the junction box and tighten Tighten the middle nut to eng...

Page 5: ... CABLE REFERENCE COLOUR CODING ZONE LENGTH 5CMH208 BLACK 2 FT 10CMH240 WHITE 10CMH277 BLUE 15CMH277 ORANGE 5CMH120 NO COLOUR 1 FT 15CMH208 20CMH240 5CMH277 LIME GREEN 10CMH120 YELLOW 30CMH208 10CMH208 DARK GREEN 15CMH120 BROWN 15CMH240 RED 20CMH277 20CMH120 GREY 20CMH208 FLUOR PINK 30CMH120 LIGHT BLUE 30CMH240 PURPLE ...

Page 6: ...nspect all electrical enclosures for moisture corrosion or foreign matter Check all electrical connections for tightness and perform an insulation resistance check with a megger from heating cable conductor to sheath ground The minimum resistance should be 5 MOhm or higher HEATING CABLE TESTING REPORT Customer Contractor Site Location Project Ref READINGS PRIOR TO INSTALLATION Insulation Resistanc...

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