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Safe-Lec 2 Conductor Bar Manual
SECTION 10 - EXPANSION SECTION ASSEMBLY
Allowable Length and Distance
• The maximum allowable conductor system length without an Expansion Section is 150 meters (492’) - Assuming a Maximum
Temperature Range of 110°F
• The maximum distance between anchor points with an Expansion Section at mid-point is 70m (230’) steel, 49m (160’) copper,
36.5m (120’) aluminum
Expansion Section Installation
1. Set expansion air gaps when installing assembly to appropriate gap setting for ambient temperature (see
Table 22-1
). The gap
is adjusted by sliding the moving lengths of conductor in or out of the expansion assembly (BOTH HALVES MUST BE SET EQUAL).
Always allow sufficient time for the conductor bars to achieve ambient temperature before setting Expansion gap. All Expansion
assemblies must be set at site, they are not pre-set before leaving the factory. Failure to set this part correctly could result in
buckling of all conductors.
2. Set anchor clamp and torque on one side, install up to next anchor clamp but DO NOT TIGHTEN. Go back and set expansion to
correct gap setting per current ambient temperature. Once gap is set, go to second anchor clamp and tighten.
Half Total Air Gap
Half Total Air Gap
ACTUAL SITE AMBIENT:
O
C (
O
F)
TOTAL GAP SETTING: mm (in)
LOWEST POSSIBLE SITE AMBIENT
O
C (
O
F) [SEE NOTE]
Table 22-1
Expansion Air Gap Setting For Conductor Bars With PVC Cover