3M Constant Force Springs for Solderless Connections

3M Constant Force Springs - P63

Solderless Connections

for Earthing & Grounding

Constant Force Springs

3M Constant Force Springs are a range of solderless connections for use on lead, or aluminium cable sheaths, to connect cable screen, or armour within a joint kit, and for use in connecting the copper screen to earth for medium voltage terminations. The products are made from Stainless Steel Type 301/302, and are compatible with all metallic screen and armour types.

Constant force springs from 3M Electrical are a solderless connection used in earthing or grounding applications to apply a uniform radial pressure onto the cable. They can be used on lead and aluminium cable sheaths, cable screening tapes or wires and steel or aluminium armour wires.

This product is RoHS 2011/65/EU Compliant and has a 10 year shelf life from date of manufacture when stored in a humidity controlled storage (-50ºC to +50ºC and <75% relative humidity).

Constant Force Springs


3M Constant Force Springs

Product Range

Part Number Product Dimensions as Supplied Application Range
Inner Diameter (mm) Spring Width (mm) Spring Tape Length (mm) Minimum Diameter (mm) Maximum Diameter (mm)
3M P59 3.5 6.0 80 4.0 10.0
3M P60 7.5 10.0 175 9.0 15.0
3M P61 11.0 16.0 225 14.0 22.0
3M P62 14.5 16.0 295 18.5 29.0
3M P63 18.5 16.0 375 23.5 37.0
3M P64 25.0 16.0 505 31.0 50.0
3M P65 32.0 20.0 710 44.0 70.0
3M P66 44.0 20.0 935 58.0 94.0
3M P67 57.0 20.0 1250 70.0 110.0
3M Constant Force Springs

3M Constant Force Springs


Some Applications

Constant Force Springs

Excerpt LV Cable jointing Manual UKPN | Constant Force Spring Service Termination Bond | position the tinned copper braid onto the lead sheath of the cable and secure it with one turn of the constant force spring. Bend the tinned copper braid back over the first turn of the constant force spring and secure it in place with rest of the constant force spring. Apply one half-lap layer of PVC tape over the spring.

Constant Force Springs

Excerpt LV Cable jointing Manual UKPN | PILC Heatshrink Mains Pot End Joints | Clean the surface compound from the cable core with an approved solvent cable wipe. Wrap the supplied length of tinned copper mesh around the exposed neutral conductor. Place one end of the tinned copper braid on the mesh around the neutral conductor and apply the smaller of the supplied constant force springs. The Jointer must ensure the constant force spring is tight.


3M ELECTRICAL – DISTRIBUTORS, STOCKISTS & SUPPLIERS

Thorne & Derrick provide competitive prices and fast delivery from stock for the complete range of 3M Scotchcast and Cold Shrink cable joints, terminations, resins and Scotch electrical tapes – we stock high voltage cable joints and terminations manufactured by 3M using Cold Shrink for 11kV, 33kV and 66kV cables.

Constant Force Springs

T&D Stock & Distribute the complete range of 3M Cable Joints & Cable Terminations using resin and cold shrink for LV, MV & HV cables.

Data Sheets