Thermal Expansion and Contraction of Cable Tray:

• A cable tray system may be affected by thermal expansion and contraction, which must be taken into account during installation.
• To determine the number of expansion splice plates you need, decide the length of the straight cable tray runs and the total difference between the minimum winter and maximum summer temperatures.
• To function properly, expansion splice plates require accurate gap settings between trays.
• The support nearest the midpoint between expansion splice plates should be anchored, allowing the tray longitudinal movement in both directions.
• When a cable tray system is used as an equipment grounding conductor, it is important to use bonding jumpers at all expansion connections to keep the electrical circuit continuous.