Because the required clearance over the Suez Canal is 152 metres (499 ft)[citation needed], the overhead line has two 221 metres (725 ft) high pylons (one on either side of the crossing) in spite of its small span width of 600 metres (2,000 ft). The pylons each have four crossarms: three for the conductors and one for catching the conductors in case of an insulator string failure.