IEEE 576-2000 pdf download

IEEE 576-2000 pdf download.IEEE Recommended Practice for lnstallation,Termination, and Testingof Insulated Power Cable as Used inlndustrial and Commercial Applications.
4.4.2.3 Minimizing pulling tension
In order to minimize the pulling tension on the cable(s), the cable should be fed into the duct run from the end nearest the bend.
4.5 Check list prior to pulling cable
a) Be sure there is adequate clearance between duct or conduit diameter and cable diameter. The bpercent fill” requirements should not he exceeded.
b) Use adequate lubrication of the proper type to reduce friction in conduit and duct pulls. The grease and oil type lubricants used on lead sheathed cables should not he used on nonmetallic sheathed cables. There is a number of commercially available wire pulling compounds that are suitable for use with non-leaded cables.
c) Avoid sharp bending of the cable at the first pulley in overhead installations by locating the pay-off reel fur enough away from the first pulley that the lead-in angle is kept relatively flat.
d) After installation, check to determine that end seals are still intact and have not been damaged to the point where water could enter. Apply suitable end seals to help protect against damage if the cable will be subjected to immersion or rain. This is particularly important if there will he a delay of some time between the pulling operation and splicing and terminating.
e) Be sure to check the maximum tension limits of the cable pulling accessories (cable grips, pulling eyes, swivels, pull rope, etc.). They should have a capacity equal to or greater than the tension limits that are required to puii the cable.
4.6 Methods of gripping cables for pulling
In general. insulated cables may be gripped either directly by the conductors or by a basketweave pulling grip applied over the cables. The method used depends on the anticipated maximum pulling tension. When pulls are low tension, a basketweave grip is used. High tension pulls will require connecting to the conductor either by means of pulling eyes or by forming a loop with the conductor itself. in some instances, it is desirable to use a grip over the outer covering in addition to the conductor connection to prevent any slippage of one with respect to the other.
The smaller sizes of non-metallic sheathed cables are usually gripped directly by the conductors by forming them into a loop to which the pull wire or rope can be attached. The insulation on each conductor is removed before the ioop is formed. Larger sizes are more easily handled by applying a pulling grip over the cable or cables, provided the pull is not too severe.
If more than one cable is involved, the ends should he hound together with friction tape before applying the grip overall. Long, hard pulls will necessitate the use of pulling eyes.
4.6.2 Lead sheathed cables
Pulling eyes for lead sheathed cables can be applied either at the factory or in the field. They must be wiped or sealed by other suitable means to the lead sheath to prevent the entrance of moisture. For shorter pulls a basketweave grip may be applied over the lead sheath or over the jacket if one is present over the lead sheath.
4.6.3 Metal clad cables
In pulling metal clad cable it is necessary to grip the armor and the conductors. This can be accomplished in a number of ways. One method requires that a portion of the armor be removed. Friction tape is then applied over the armor and down over the conductors, and a long basketweave grip is applied in such a way that it grips both the armor and the conductors. Another method requires that two holes be drilled through the cable (armor and conductors) at right angles to each other and that a loop be formed by passing steel wires through the holes and out over the end of the cable. A third approach would be to use a pulling eye and a grip together, the grip being applied over the armor to prevent its slipping back. The armor is not a tension member. Be certain pulling load is taken by the conductors.
5. Sidewall pressure
The sidewall pressure in general is expressed as the tension out of a bend expressed in newtons (pounds) divided by the inside radius of the bend expressed in meters (feet). Equation 5 is for one cable. Equations 5a and Sb are for the “worst case” condition with three single cables.