Automation Canada - Cables & Connectors Issue - 33

CABLE STRUCTURE
The design of a cable varies from a single conductor to multi-conductor
with many options in insulation, shielding and jacket material. The
design of the cable needed will depend on its application and
environmental properties. Here are a few options:
INSULATION
Polyvinyl Chloride (PVC) - The least expensive thermoplastic, but results
in a larger overall cable diameter (usually around 30 percent) compared
to PVC/Nylon.
PVC/Nylon (THHN) - Currently meets NFPA 79 but may change in
future additions. Thermoplastic may melt during high inrush current
situations. Has been a popular choice for motor and control wiring in
the US because the nylon passes critical abrasion tests with less
thickness than just PVC. This means that insulation walls can be 30
percent less thick, which allows for a smaller OD. Some other hybrid
versions have been used with semi-conductive properties that have a
capability of dissipating launch points, which can cause premature
cable failure.
Crosslinked Polyethylene (XLPE) - XLPE is a thermoset insulation so it
vaporizes (doesn't melt like thermoplastics) under high current
situations. Larger insulation thickness (approximately 30 percent)
compared to PVC/Nylon insulation. NFPA 79 (2018) seems to indicate
this is the future requirements for chapter 12 and the cable
manufactures are trending to develop their new products with XLPE
insulation.
Polyethylene/Polypropylene (PE) - Thermoplastic with good insulation
for low capacitance requirements for motors. It has a low operating
temperature can't meet the 90┬░C required by UL 2277.

radiated noise (EMI under 500 MHz). Maximum coverage is usually at
85 percent due to weave, and that allows higher frequency noise to slip
out. Braid shields are normally used with aluminum/Mylar tape or wraps
for motor application dissipate the high frequency noise that passes
through the copper braid. Braided shields are a time consuming
process and can add an additional 20-30 percent to cable material
costs.
Copper Wrap - A good low cost option for stationary applications.
Provides 100 percent coverage and helps to provide better flame
resistant properties to meet UL 2277, but makes cables very rigid.
JACKET
PVC - Generally the most cost effective.
Polyethylene (PE) - can be used for low smoke, zero halogen
applications, however it is a very stiff jacket and does not usually meet
UL 2277 requirements.
Polyurethane (PUR) - can be used for flexing applications, however it
also does not usually meet UL 2277 requirements.
Rubber - Comes in TPR (thermo-plastic rubber) or Thermoset Rubber
versions (EPR, PCP, XLPO or CPR)
Continuously Corrugated Welded Type MC-HL - This is a more niche
addition to the VFD market which has an additional continuously
welded aluminum armoring under the PVC jacket in lieu of a braid
shield. This armoring provides an additional protection against
crushing and is the accepted practice for long lengths of cable that are
not installed with protection of trays or conduit. This design is
acceptable for Class 1 Division 1 explosion proof environments. It is
more commonly used in infrastructure cables than in machine or OEM
builder products due to its reduced flexibility. MC-HL is not a standard
stocking item that HELUKABEL® offers in our product portfolio.

SHIELDING
Copper Braid - Good low frequency noise protection against external

C A N A D I A N A U TO M AT I O N

VOLUME 3, ISSUE 2

33



Automation Canada - Cables & Connectors Issue

Table of Contents for the Digital Edition of Automation Canada - Cables & Connectors Issue

Automation Canada - Cables & Connectors Issue - 1
Automation Canada - Cables & Connectors Issue - 2
Automation Canada - Cables & Connectors Issue - 3
Automation Canada - Cables & Connectors Issue - 4
Automation Canada - Cables & Connectors Issue - 5
Automation Canada - Cables & Connectors Issue - 6
Automation Canada - Cables & Connectors Issue - 7
Automation Canada - Cables & Connectors Issue - 8
Automation Canada - Cables & Connectors Issue - 9
Automation Canada - Cables & Connectors Issue - 10
Automation Canada - Cables & Connectors Issue - 11
Automation Canada - Cables & Connectors Issue - 12
Automation Canada - Cables & Connectors Issue - 13
Automation Canada - Cables & Connectors Issue - 14
Automation Canada - Cables & Connectors Issue - 15
Automation Canada - Cables & Connectors Issue - 16
Automation Canada - Cables & Connectors Issue - 17
Automation Canada - Cables & Connectors Issue - 18
Automation Canada - Cables & Connectors Issue - 19
Automation Canada - Cables & Connectors Issue - 20
Automation Canada - Cables & Connectors Issue - 21
Automation Canada - Cables & Connectors Issue - 22
Automation Canada - Cables & Connectors Issue - 23
Automation Canada - Cables & Connectors Issue - 24
Automation Canada - Cables & Connectors Issue - 25
Automation Canada - Cables & Connectors Issue - 26
Automation Canada - Cables & Connectors Issue - 27
Automation Canada - Cables & Connectors Issue - 28
Automation Canada - Cables & Connectors Issue - 29
Automation Canada - Cables & Connectors Issue - 30
Automation Canada - Cables & Connectors Issue - 31
Automation Canada - Cables & Connectors Issue - 32
Automation Canada - Cables & Connectors Issue - 33
Automation Canada - Cables & Connectors Issue - 34
Automation Canada - Cables & Connectors Issue - 35
Automation Canada - Cables & Connectors Issue - 36
Automation Canada - Cables & Connectors Issue - 37
Automation Canada - Cables & Connectors Issue - 38
Automation Canada - Cables & Connectors Issue - 39
Automation Canada - Cables & Connectors Issue - 40
Automation Canada - Cables & Connectors Issue - 41
Automation Canada - Cables & Connectors Issue - 42
https://www.nxtbook.com/kerrwil/AutomationCanada/automation-canada-machine-safety
https://www.nxtbook.com/kerrwil/AutomationCanada/auto-tuning-and-variable-frequency-drives
https://www.nxtbook.com/kerrwil/AutomationCanada/automation-canada-automation-in-2021
https://www.nxtbook.com/kerrwil/AutomationCanada/AutomationCanadaMachineSafetyMay2021
https://www.nxtbook.com/kerrwil/automationcanadaquarterly/AutomationCanadaV2I5
https://www.nxtbookmedia.com