Pull pits (also called cable pull pits or draw pits) are underground access chambers installed along buried conduit routes to help pull, route, and service electrical and communication cables. In EV charging infrastructure, pull pits are used to make long cable runs feasible, reduce pulling force, provide inspection access, and enable future expansion without re-trenching the entire route.
Why Pull Pits Matter in EV Charging Installations
EV charging sites often require long underground runs between the grid connection point, switchboards, and charge points.
– Reduces cable pulling tension and risk of insulation damage
– Enables longer conduit routes with fewer installation risks
– Improves maintenance access for fault finding and cable replacement
– Supports phased rollout by allowing spare ducts and later cable additions
– Helps manage routing around obstacles such as drainage, foundations, and utilities
Where Pull Pits Are Typically Used
Pull pits are placed at locations where cable pulling becomes difficult or where access is likely to be needed.
– At changes in direction, such as 90° bends or complex routing
– At long straight runs to break the route into manageable pulling sections
– Near distribution boards, transformers, or service entry points
– Close to charging islands, curbside cabinets, or charging hubs with multiple feeders
– At duct intersections where multiple circuits branch to different chargers
How Pull Pits Work
Pull pits create a controlled access point to guide and pull cables through conduits.
– Conduits enter and exit the chamber with smooth transitions
– Installers pull cables in stages from pit to pit rather than in one long pull
– The chamber provides space for handling pulling ropes, lubricants, and bending radius control
– Covers allow inspection, cleaning, and future cable work without excavating the full route
Key Design Considerations
Correct pull pit design prevents flooding issues, cable damage, and access problems.
– Size the pit to the cable type, number of ducts, and minimum bending radius
– Use durable materials suitable for traffic loads and site conditions
– Provide safe covers rated for pedestrian zones or vehicle traffic areas as required
– Plan drainage or water management where pits may collect water
– Keep separation between power and data conduits where required
– Include spare ducts for scalability and future charger additions
Pull Pits vs Manholes
These terms are sometimes confused but serve different purposes.
– Pull pits are typically smaller and focused on cable pulling and access along conduit runs
– Manholes are larger chambers often used for deeper utility infrastructure and multi-service access
– In EV charging projects, pull pits are common for LV power and comms ducting in car parks and streetscapes
Common Issues and Risks
– Poor placement causing difficult pulls, excessive bends, or inaccessible chambers
– Water ingress leading to corrosion, insulation degradation, or frozen covers in winter
– Incorrect load rating resulting in cover failure in vehicle areas
– Overfilled pits with insufficient space for safe cable handling and maintenance
Related Glossary Terms
– Conduit routing
– Cable management
– Trenching
– Manhole chambers
– LV / MV infrastructure
– Switchgear
– Grid connection
– Maintenance access planning