Lead Wiping | A Disappearing Cable Jointers Skill Video Tutorial
Published 16 Apr 2019
How to Wipe Lead Cables
Prior to Cable Jointing
uploaded by - Chris Dodds Thorne & Derrick Sales & Marketing Manager
Heat shrink cable joints for jointing paper or polymeric insulated cables (PILC or XLPE) with lead sheaths are specified for Low Voltage power distribution systems in the oil, gas and petrochemical industries where underground cables are exposed to waterlogging and corrosive liquids and vapours – cable construction including the lead sheath cover or jacket protects against penetration and degradation of electric cable insulation by hydrocarbon contaminants (whether underground or airborne).
Today, lead wiping has virtually disappeared from the cable jointers skill-set as more modern techniques, such as constant force spring armour and lead earthing continuity kits, which are integral to 3M hydrocarbon resistant cable joint kits have become commonplace. The modern day trend towards the manufacture and adoption of Polymeric (XLPE EPR insulated) cables has further reduced the demand for jointers with competency to work, maintain and splice using PILC type cables.
Cable Jointing & Lead Wiping
Lead Sheath Cutting & Removal From Paper Insulated Cables
Due to Occupational Health & Safety problems with handling lead and associated fumes, lead wiping has been replaced by jointing the cable sheaths using copper earth braid and constant force springs.
Pictured : A cable repair being conducted on a 200 pair (400 wire) lead-sheathed, paper-insulated cable (PILC). The photo illustrates the difficult conditions under which cable jointers often have to work. The gas lantern is required for both lighting and heating as it is important that the paper insulation of the individual wires do not become damp.
The joining of paper-insulated, lead-sheathed cables is not an easy task. Each 200 pair joint can take over two days to complete. The wires are identified by a colour code and are layered in a particular way: a common mistake when repairing these cables is to join pair number 1 to pair number 200 (i.e. 180 degrees out of phase). Each wire is individually joined together and covered by a paper sleeve. The photo below shows a close-up of the cable being spliced with some pairs having been joined and the remainder temporarily folded back out of the way.
LV Cable Joints (Low Voltage Cables)
Thorne & Derrick stock and distribute LV Joints in Cold Shrink, Heat Shrink or Resin Cast technologies – multicore and multi-pair cable joints are available for immediate backfill and energisation of Low Voltage power, control and instrumentation cables 600V/1000V 3.3kV.
- LV Cable Diversion 4 Core PILC to 4 Core Wavecon Straight Joint
- PILC Replacement & Cable Longevity
- Cable Splicing At The Lazy Q Ranch
Complete range of LV Cable Accessories ➡