What is the difference between end sleeves НШВИ and НШВ?

The main difference is that НШВИ has an insulation cuff. The functions of this cuff are as follows: protection of wire from bending, stopper of the wire that leaves only insulated part outside the connection, color identification, more comfort due to easy grabbing by fingers, wide entrance of the cuff for quick input of the wire.

When it is better to use non-insulated end sleeves НШВ?

Mainly when you want to save some money. Sometimes when you need a heat resistant connection, for example, when you use cables with Teflon or organic-silicon insulation. Maximal operation temperature for insulated end sleeves with PVC or nylon cuff is no more than 150°C. When insulation is too thick and cannot be pushed inside the cuff, it is better to use non-insulated end sleeves. One more reason for the usage of non-insulated sleeves is a need to connect 2 or 3 cables. There is however a type of insulated end sleeve for connection of two cables, it is called НШВИ (2).

When it is better to use insulated round pin terminals НШКИ instead of НШВИ?

Both types have the same contact part, both have the same shape of a pin after crimping, both types are designed for connection of stranded cables. Pin rounded end sleeves are more expensive. The reason for that is in their wider function: round pin end sleeve with red cuff performs the same function as 4 insulated end sleeves НШВИ in the cross-section range from 0.5-1.5 mm²; round pin end sleeves with a blue and yellow cuff covers the same functions as two types of common insulated end sleeves НШВИ.

Can I use insulated end sleeves НШВИ (2) for connection of 1 cable?

In theory, you can. You just will need to choose the size of the cable that corresponds to the size of this end sleeve. Please note that the function of protection from bending will not work properly in this case.

Some insulated end sleeves have different lengths of the contact part. How to choose the correct length?

It depends on the socket part of the contact disconnector. The contact part should enter a disconnector until the very end of the crimped part. Anyway, if your end sleeve occurred to be too long, you can easily cut the necessary length after crimping.

What are your recommendations for the usage of end sleeves for connections?

It is the best choice every time when you deal with a stranded cable and a socket of a disconnector or other electro-technical device. End sleeves are ideal for stranded cables because you do not have to worry that a wire could be damaged, so you can be sure in the cross-section of the cables connected.

Why is the standard mechanical strength of the end sleeves less than for ring terminals?

The main request for the end sleeve is safe consolidation of copper wires; mechanical strength request is minimal because there will be additional crimping in inside the disconnector by means of “push-in” or “cage clamp” method.

The sleeve gets a square profile after crimping. Does it affect contact resistance in the disconnector?

All tools designed for crimping of end sleeves have square-like profiles. It can be of square, trapezoidal form, or trapezoidal with an indent. As a rule, a crimped end sleeve has notches all over its body for a better connection with the wire. Moreover, the spot of electric contact is more for square than for round surfaces.

Why do you have insulted end sleeves of two types: for one and for two cables, but there is only one type of non-insulated sleeves- for one cable?

The main reason is in the cuff. Insulated end sleeves have a cuff that due to its form does not let to put inside more cables than it was designed for. Non-insulated end sleeves do not have any cuff, so there is no obstacle for putting 2 or more cables if the cross-section size lets you do it.

Why do you have insulted end sleeves of two types: for one and for two cables, but there is only one type of non-insulated sleeves- for one cable?

The main reason is in the cuff. Insulated end sleeves have a cuff that due to its form does not let to put inside more cables than it was designed for. Non-insulated end sleeves do not have any cuff, so there is no obstacle for putting 2 or more cables if the cross-section size lets you do it.