IEC 60670-22 pdf download – Boxes and enclosures for electrical accessories for household and similar fixed electrical installations – Part 22: Particular requirements for connecting boxes and enclosures

IEC 60670-22 pdf download – Boxes and enclosures for electrical accessories for household and similar fixed electrical installations – Part 22: Particular requirements for connecting boxes and enclosures
12.102 Retention means for terminals or connecting devices shall withstand the mechanicalstresses occurring during installation and normal use.
Compliance is checked by connecting conductors in accordance with the relevant Part(s) 2 oflEc 6o998 for the type of the connecting device used.
After the test there shall be no harmful deformation,cracks or similar damage which wouldlead to non-compliance with this part.
12.103 Connecting boxes classified according to 7.101.1，7.101.2 and 7.101.3 shall complywith the temperature rise requirements of Clause 16.102.
13 Resistance to ageing, protection against ingress of solid objects and
against harmful ingress of water
This clause of Part 1 applies with the following addition:
13.3.3 Replace the last paragraph by the following:
The specimens,except connecting boxes classified according to 7.101.4,shall withstand anelectric strength test specified in 14.2 which shall be started within 5 min of the completion ofthe test according to this subclause.
14Insulation resistance and electric strength
This clause of Part 1 applies with the following addition:
Add the following:
14.2.101 For boxes with integrated or incorporated terminals or connecting devices，themeasurements are made consecutively as indicated below.
Each clamping unit of a connecting device shall be connected alternatively with conductors ofthe smallest and the largest cross-sectional area.
The insulation resistance is then measured with a d.c. voltage of approximately 500 v applied,the measurement being made 1 min after application of the voltage.
a) between all clamping units connected together and the body for connecting devices
without fixing means or between all clamping units connected together and the mountingbase for connecting devices with fixing means;
b) between each clamping unit and all others connected to the body for connecting devices
without fixing means or between each clamping unit and all others connected to themounting base for connecting devices with fixing means.
The metal foil is applied in such a way that the sealing compound, if any, is effectively tested.
15 Mechanical strength
This clause of Part 1 applies with the following amendment:15.1Replace the note by:
NOTE Damage to the finish, small dents which do not reduce creepage distances or clearances below the valuespecified in Table 102 and small chips which do not adversely affect the protection against electric shock orharmful ingress of water are disregarded.
16 Resistance to heat
This clause of Part 1 applies with the following addition:
Add the following subclauses:
16.101 Connecting devices having parts of insulating material shall be sufficiently resistantto heat.
Compliance is checked by the test of 16.101.1 to 16.101.3.
16.101.1 The specimens or portions of the specimens are kept for 1 h in a heating cabinet ata temperature of (85± 2)°c.
During the test they shall not undergo any change impairing their further use and sealingcompound if any,shall not flow to such an extent that live parts are exposed.
After the test and after the specimens have been allowed to cool to approximately ambienttemperature，there shall be no access to live parts which are normally not accessible whenthe ‘specimens are mounted as in normal use, even if the test probe B of lEC 61032 is appliedwith a force not exceeding 5 N.
After the test,markings shall still be legible.
16.101.2 Parts of the insulating material not necessary to retain current carrying parts andparts of the earthing circuit in position，even though they are in contact with them, aresubjected to a ball-pressure test as described in clause 16.1 of Part 1 but at a temperature of(70 ± 2) C or (40 主 2)°C, plus the highest temperature rise determined for the relevant partduring the test of 16.102.4,whichever is the higher.
16.101.3 Parts of the insulating material necessary to retain current carrying parts and partsof the earthing circuit in position are subjected to a ball pressure test in a heating cabinet ata temperature of (125土 2)°c.
16.102 Connecting devices integrated or incorporated in connecting boxes shall be soconstructed that the temperature rise in normal use does not exceed the value specified in16.102.4.
Compliance is checked by the tests of 16.102.1 to 16.102.3.
16.102.1 Connecting devices with a single terminal (see Figure 101) having one or moreclamping units shall be connected to conductors in the intended manner and the mostunfavourable conditions.