WYLEX AM3 User manual

Electrium Sales Limited, Walkmill Lane, Cannock, WS11 0XE
Tel: [phone] Fax: [phone]
LF1514_4 Page 1of 2
Installation instructions,
AM3 SKELETON (L TYPE)
FIXED BUSBAR RANGE
IMPORTANT INFORMATION
This unit should be installed by a qualified competent person in accordance with all relevant legislation and regulations
including building regulations and wiring regulations BS7671. If in doubt contact a qualified competent person.
•Turn off all power supplying this equipment before working on or inside the equipment.
•Always use a properly rated volt-sensing device to confirm the power is off.
•Replace all devices, doors and covers before turning on the power to this equipment.
•To avoid ingress of swarf and similar material, always remove gland plates to allow cutting/slotting for cable entries.
Failure to follow these instructions could result in serious injury or death.
DO NOT USE POWER TOOL SCREWDRIVERS ON ELECTRICAL CONNECTIONS
•After installation, tests must be carried out in accordance with the
requirements of the current edition of the IET Wiring Regulations. It
is essential that the user guide is drawn to the attention of the
person responsible for its operation and is at all times available for
ready reference.
•The total current supplied by the unit must not exceed the rating of
the incoming main switch or RCD or any additional limitation (as
shown on the way label).
•The total sum of the individual MCB ratings may exceed this value
where there is appropriate diversity on the installation. It is
expected that only one outgoing circuit will exceed 32A rating and
it is recommended that this is installed adjacent to the incoming
main switch or RCD. Others may be fitted if the diversity allows
and the total load is not exceeded.
•The consumer unit must be de-rated as follows: - Max. 100%
rating, continuous load (in excess of 1 hour) 90% of incomer
rating. A diversity factor of 90% should be applied to all RCDs.
•This product is suitable for mounting within a meter cabinet only
and is rated at IP2XC.
•The consumer unit and associated components are designed for
use with copper cables and have been type tested to the following
specifications: -
Consumer Unit
BSEN61439-3
MCB’s
BSEN 60898-1
RCD’s
BSEN 61008-1
RCBO’s
IEC 61009-1
Main Switch
BSEN 60947-3
Ambient Temperature Considerations
The NH Range of MCB’s are calibrated to meet the 30°C Ref
Calibration Temperature requirements of BSEN 60898.
At other temperatures the following rating factors should be used:-
At 60°C 0.9
At 20°C 1.0
At 0°C 1.1
Adjacent thermal-magnetic MCBs should not be continuously
loaded or approaching their nominal rated currents when mounted
in enclosures. It is good engineering practice to apply generous
derating factors or make provision for adequate free air between
devices. In these situations, and in common with other
manufacturers, we recommend a 60% diversity factor is applied to
the MCB nominal rated current where it is intended to load the
MCB’s continuously (in excess of 1 hour)
Before fitting the front cover, check the tightness of all
connections, including factory made connections.
Device
Max. Cable
Capacity
Recommended
tightening torque
Main Switch / RCD
50mm2
2.3Nm
MCB
25mm2
2.3Nm
Standard RCBO
Outgoing connection
- 16mm2
2.0Nm
Busbar connection
2.5Nm
Miniature RCBO
Outgoing connection
- 16mm2
2.0Nm
Busbar connection
2.5Nm
Earth & neutral
terminals
16mm2
1.7Nm
Use No.2 Pozidrive bit
1. Enclosure Mounting
•Remove appropriate KO’s, cover and outer cable shroud from the
enclosure. Note, the top gland plate can be removed for ease of
KO removal.
•The unit must be mounted with the gland plate facing upwards.
•Mount the unit into its installation position, Both ‘L’ brackets
provided must be fitted in positions ‘a’ OR ‘b’, see Fig 2.1. When
installed the base of both ‘L’ brackets should sit flush against the
enclosure back wall in order to support the unit. Assess which ‘L’
bracket position (a OR b) best suits the installation and which
bracket fixing holes should be used (the depth of the bracket fixing
can be adjusted using the various bracket holes). Remove the unit
from the installation.
•Remove the appropriate ‘L’ bracket fixing blanks from positions ‘a’
OR ‘b’ (4 per bracket) by drilling or knocking out from the inside of
the unit. The baseplate should be removed to aid the ‘L’ bracket
installation.
•Use the following fasteners provided to attach each ‘L’ bracket to
the box: 4 x M5 screws, 4 x M5 nuts and 8 x M5 serrated washers,
See Fig. 2.1.
•Mount the unit into its installation position. Secure the wing fixings
first using M6 fixings. Both ‘L’ brackets should then be screw-fixed
with M6 size screws (not supplied) to the cabinet back wall. See
Fig. 2.2.
•Check the unit is securely mounted.

Electrium Sales Limited, Walkmill Lane, Cannock, WS11 0XE
Tel: [phone] Fax: [phone]
LF1514_4 Page 2of 2
Installation instructions,
AM3 SKELETON (L TYPE)
FIXED BUSBAR RANGE
Fig. 1.1
Fig. 1.2
•Bring cables through appropriate apertures.
•Route main incoming cables to desired position.
2. Connection of Main Incoming Device
•Cut and dress the main incoming cables and earth conductor. Fit
them into the appropriate terminals. (Fig 2.1)
Note: Extra holes are provided on the earth bar for
bonding purposes.
•Tighten the main incoming terminals securely.
(See recommended tightening torque.)
Fig 2.1 Incoming Terminal Connections
3. Installation of MCB’s and RCBO’s
•Only NHX range MCBs and NHXSBS range RCBOs must be used
within Wylex AM3 skeleton range consumer units.
•Slide MCB onto busbar (Fig 3.1)
Fig 3.1
•Ensure MCB engages onto the mounting rail
•Tighten terminal screw. (See recommended tightening torque.)
•NOTE:
Cage type terminals are used in these devices. Ensure the
terminals are opened fully before inserting cables (suitable for
copper cables only).
•It is recommended that the highest rated MCB or RCBO is fitted
nearest to the main incoming device (or split-load RCD where
relevant).
4. Circuit Connections to MCB’s and RCBO’s
•Cut, dress and connect circuit conductors to appropriate MCB,
RCBO, neutral and earth terminals. (Figs 4.1 and 4.2)
•Ensure that each neutral outgoing circuit is correctly made to its
corresponding numbered terminal (Figs 4.1 and 4.2)
Fig 4.1 Connections to MCB’s
Fig 4.2 Connections to RCBO’s
5. Installation of Control Devices
•Control devices such as timers, transformers and contactors can
only be fitted to the consumer units supplied with an accessory rail.
The incoming supply for the device must be fed from an MCB (not
directly from the busbar).
6. Circuit Identification
•The consumer unit way label is fixed on the front cover of the
consumer unit.
•Pre-printed identification labels are provided and should be fixed in
position on the way label according to the outgoing circuit.
7. Replacement of Covers.
•It is important to replace the busbar insulation shield and fit
the front cover to complete the installation.
•The outer cable shroud should be fitted after the front cover is
fitted. The shroud is screwed directly to the unit fixing wings.
The shroud can be adjusted vertically to ensure all cables
entering the top gland plate are shrouded. See Fig. 7.1. and
7.2.
Fig. 7.1 Fig. 7.2
8. Blanking of Unused Ways
•Blanking plates should be fitted to cover any spare modular ways.
Blanking plates are available if required.
9. Testing of the Installation
•After completion of the installation, it is essential that it is tested in
accordance with the latest Edition of the IET Wiring Regulations for
Electrical Installations (BS7671).
•It is important that the following are included in the above: -
- Operation of the test button of any RCD’s fitted.
- Verification that the earth loop impedance requirements are
satisfactory.