Cord Anchorage Strain and Twisting Test Equipment
Standard: Clause 25.15 of IEC 60335-1 Household and similar electrical
appliances – Safety – Part 1: General requirements and etc.
Application: It is used to check the cord anchorage of the appliances provided
with a supply cord, and appliances intended to be permanently
connected to fixed wiring by a flexible cord, shall relieve
conductors from strain, including twisting, at the terminals and
protect the insulation of the conductors from abrasion.
Test sample: Household appliances, medical equipment, lamps, plugs and sockets
and etc.
Feature: The test equipment adopts Z-word structure, can be used to test
the clamping terminal firmness of the refrigerators, washing
machines and other large household appliances’ power cords.
The test method is that a mark is made on the cord at a distance of
approximately 20 mm from the cord anchorage or other suitable
point. Then the cord is then pulled, without jerking, for 1 s in
the most unfavourable direction with the force specified. The test
is carried out 25 times. The cord, unless on an automatic cord
reel, is then subjected to a torque that is applied for 1 min.
After above test, the cord shall not be longitudinally displaced by
more than 2 mm.
Parameters:
| Input Power | AC220V 50HZ |
| Pull Force Weight | 20N*2,30N*2 (the pulling force of 30N,60N,80N,100N can be
achieved); |
| Torque Weight | 5N*1, 12.5N*1, 17.5N*1 and a torque arm (0.1Nm,0.25Nm,0.35Nm can be
acheived); |
| Pull Test Cycles | 0~999999, can be preset, default 25 |
| Pull Speed | 1 cycles/s |
| Torque Time | 0.01S～99 hour 59 min 59 s |
| Fixture | Tension fixture and torque fixture are combined, which coordinated in the middle through the bearing, reduce the friction
during torque test. |
| Structure | The device adopts motor cam mandrel mechanism, Z-word connection,
so that the fixture can hold the power cord which is on the
appliance and 150mm above from the ground. |
Table – Pull force and torque.
| Mass of appliance (kg) | Pull force (N) | Torque (Nm) | Combination of Pull Force Weight and Torque Weight |
| ≤1 | 30 | 0.1 | 30N+5N |
| > 1 and ≤4 | 60 | 0.25 | 2*30N+12.5N |
| > 4 | 100 | 0.35 | 2*30N +2*20N+17.5N |
