World Cord Sets, Inc

Data Centers: Choosing the right jacket type for your installation. SJT vs SVT



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 ColorGreen
Line Conductor ColorBlack
Neutral/Line 2 Conductor ColorWhite
Max Voltage300V
Max Amps10A

 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 used, 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 ColorGreen
Line Conductor ColorBlack
Neutral/Line 2 Conductor ColorWhite
Max Voltage300V
Max Amps10A

 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 RackLength of Cable in InchesCable Outer DiameterTotal Volume of Cable in Rack
1413-F-036 (3FT C14 to C13 Power SJT)48360.287 in3495.94 in3
1413-F-072 (6FT C14 to C13 Power Cord SJT)48720.287 in3991.87 in3



Total Cable Volume1487.81 in3

Calculation based on a 48U server rack.


SVT Cables

World Cord Sets, Inc Part #Number of Cables in RackLength of Cable in InchesCable Outer DiameterTotal Volume of Cable in Rack
1413-SVT-036 (3FT C14 to C13 Power SVT)48360.245 in3423.36 in3
1413-SVT-072 (6FT C14 to C13 Power Cord SVT)48720.245 in3846.72 in3



Total Cable Volume1270.08 in3

Calculation based on a 48U server rack.


Comparison of volume occupied in a 59,000 inrack.

SJT Cables1487.812.52% of rack
SVT Cables1270.082.15% of rack