Choosing the right jacket type for your installation. SJT vs SVT
Created on: Mar 20, 2018
Overview
When buying power cables for your next data center installation, you will have to make the decision on buying SVT cables vs SJT cables. (Most commonly found with C14 to C13 10A Cables). In this short article we'll go over the advantages and disadvantages of both cables to help you make the right buying decision.
18awg-3c SJT Cordage
SJT stands for Service Junior Thermoplastic, which, in all honesty, does not really mean anything to you. So, let's look at some of the information regarding SJT jacket used with 18/3 conductors.
| Outer Diameter | ~ 0.287 inches |
| Jacket Material | PVC |
| Insulation Material | PVC |
| Ground Conductor Color | Green |
| Line Conductor Color | Black |
| Neutral/Line 2 Conductor Color | White |
| Max Voltage | 300V |
| Max Amps | 10A |
SJT Technical Information when used with 18/3 conductors
18awg-3c SVT
SVT stands for Service Vacuum Thermoplastic and is a lighter duty version of SJT cordage. Designed for light indoor use, it is thinner and slightly less durable that it's SJT counterpart. Let's look at some of the technical information regarding SVT cordage.
| Outer Diameter | ~ 0.245 inches |
| Jacket Material | PVC |
| Insulation Material | PVC |
| Ground Conductor Color | Green |
| Line Conductor Color | Black |
| Neutral/Line 2 Conductor Color | White |
| Max Voltage | 300V |
| Max Amps | 10A |
SVT Technical Information when used with 18/3 conductors
SJT vs SVT Comparison in a High-Density Rack
Now that we know a little bit about the differences between SJT and SVT jackets, let's run some numbers in a high-density cabinet scenario.
SJT Cables
| World Cord Sets, Inc Part # | Number of Cables in Rack | Length of Cable in Inches | Cable Outer Diameter | Total Volume of Cable in Rack |
| 1413-F-036 (3FT C14 to C13 Power SJT) | 48 | 36 | 0.287 in3 | 495.94 in3 |
| 1413-F-072 (6FT C14 to C13 Power Cord SJT) | 48 | 72 | 0.287 in3 | 991.87 in3 |
| Total Cable Volume | 1487.81 in3 |
Calculation based on a 48U server rack.
SVT Cables
| World Cord Sets, Inc Part # | Number of Cables in Rack | Length of Cable in Inches | Cable Outer Diameter | Total Volume of Cable in Rack |
| 1413-SVT-036 (3FT C14 to C13 Power SVT) | 48 | 36 | 0.245 in3 | 423.36 in3 |
| 1413-SVT-072 (6FT C14 to C13 Power Cord SVT) | 48 | 72 | 0.245 in3 | 846.72 in3 |
| Total Cable Volume | 1270.08 in3 |
Calculation based on a 48U server rack.
Comparison of volume occupied in a 59,000 in3 rack.
| SJT Cables | 1487.81 | 2.52% of rack |
| SVT Cables | 1270.08 | 2.15% of rack |
Author:
Brian Sackett
Marketing & Development
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