Installation
2-8
GUPS 2400A
–107 Operation Manual
5. Derate the above wire gauge (use a heavier gauge) for an increased number of current
carrying conductors. This offsets the thermal rise of bundled conductors.
Number of
Current
Conductors
Capability
3 to 6
80%
Above 6
70%
6. The preferred insulation material is application dependent. Elgar recommends any flame
retardant, heat resistant, moisture resistant thermoplastic insulation rated to a nominal 75°C
(167°F). Voltage breakdown must exceed the combined effects of:
•
The rated output voltage;
•
Transient voltages induced onto the conductors from any source;
• The differential voltage to other nearby conductors; and,
• Safety margins to accommodate degradations due to age, mechanical abrasion and
insulation migration caused by bending and temperature.
7. As frequency increases, the magnetic field of the current carrying conductors becomes
more significant in terms of adverse coupling to adjacent electrical circuits. Use twisted
pairs to help cancel these effects. Shielded twisted pairs are even better. Avoid close
coupling with nearby cables by using separate cable runs for high power and low power
cables.
8. The above general values and recommendations should be reviewed, modified and
amended, as necessary, for each application. Cables should be marked with appropriate
safety WARNING decals as hazardous voltages may be present.
