Abtech MJB Series Guide

ABTQ-36 rev 03 1/2
Last review: 08th Dec 21
A B Controls and Technology Ltd
Sanderson Street, Lower Don Valley, Sheffield
INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS FOR
ABTECH ‘MJB’ RANGE ENCLOSURES – SIRA99ATEX3176
Marking
The marking shown is for an apparatus certified terminal box.
The maximum voltage and power dissipation permitted in this terminal
box are marked on the label and identified by VOLTAGE__kV MAX and
RATING________WATTS respectively.
The ambient temperature range for which this product is suitable is
marked on the label and identified by Tamb____.
Installation
1) Using the mounting dimensions data provided, either in the product catalogue data sheets or
on the drawings supplied (as part of the project documentation) mark out the positions for the
mounting holes on the surface where installation is required.
2) Drill the mounting holes for either M8 or M9 fixing studs (for size S64 upwards) or for M6 fixing
studs for size S45.
3) Insert the top two studs leaving 8 to 10mm protruding and lift the enclosure into position using
such assistance as may be necessary to avoid injury and hang the top fixing brackets of the
box onto the studs. Ensuring that the box is secure, insert and tighten the bottom two studs.
Now complete tightening the top two studs.
4) Unfasten the lid securing screws and remove the enclosure lid. Put the lid in a safe place.
5) Install and secure the cable glands in accordance with the manufacturers instructions.
6) Pull the cables into the box leaving trailing leads long enough to reach their respective couplers
after routing through any cable clamps that are provided.
7) Trim each cable core so that the conductor end will reach the inside stop of the crimp lug on
which it is to be terminated.
8) Strip each cable core insulation by the length of the crimping barrel plus 2mm.
9) Remove each crimping lug in turn from the terminal post and place the securing nuts to one
side.
10)Crimp each lug onto the respective conductor using Cembre die sets or equivalent. Ensure that
the crimp die set used is suitable for the conductor size and is not damaged or excessively
worn. The crimp die set may produce either a hexagon type crimp or an indent type crimp. With
hexagon die sets execute at least two crimps on each lug.
11)Place the hole in the palm of the now attached cable lug on to its respective terminal post.
When both cable lugs for a terminal post have been attached secure them in place with the flat
washer, spring washer and nut provided. Ensure that the spring washer is fully compressed
then apply a further ¼ turn. Where a torque wrench is use, ensure that the spring washer is
fully compressed by the first lock nut then, using a spanner to secure the locknut under the
lower crimp lug, apply the torque, minimum 17.5Nm, maximum 19.5Nm. Repeat for each
terminal post.
12)When all the cable lugs have been attached and correctly tightened replace the lid and secure
it by closing the lid and tightening the lid fixing screws. Ensure that all gland plate securing
screws are tightened.
Earthing/Grounding
All MJB range enclosures are provided with an internal and external earthing/grounding facility.
This must be connected to the appropriate earth bonding circuit before electrical power is
connected to the contents of the enclosure. If the MJB unit is to be used for three phase
distribution any earth/ground conductor brought into the enclosure must be terminated onto the
enclosure internal earth/ground stud. If the MJB unit is to be used for single phase or DC
distribution any earth/ground conductor entering the enclosure may be terminated onto the
otherwise unused post terminal

ABTQ-36 rev 03 2/2
Last review: 08th Dec 21
A B Controls and Technology Ltd
Sanderson Street, Lower Don Valley, Sheffield
Operation
1. The lid must be secured using all the lid screws provided in order to maintain the IP rating.
2. No attempt must be made to remove the enclosure lid whilst electrical power is connected to
the contents of the enclosure.
3. The earthing/grounding facility must be connected to the earth bonding circuit at all times when
electrical power is connected to the enclosure.
Maintenance
Routine maintenance is likely to be a requirement of local Health and Safety legislation. The laws
of the applicable country must be considered and maintenance checks carried out accordingly.
Additional checks that are advisable to ensure the efficiency of ABTECH ‘S’ range enclosures are:-
Activity
Frequency
1
Check that the lid seal is not damaged and is in place
Each time the
enclosure is opened
2
Check that all lid fixing screws are in place and secured
Each time the
enclosure is opened
3
Check that all gland plate fixing screws are in place and secured
Each time the
enclosure is opened
4
Check that the mounting bolts are tight and free of corrosion
Annually
5
Check the security of all cable glands
Annually
6
Check the enclosure for damage
Annually
Chemical Attack
The ABTECH MJB units are manufacture from 316 stainless steel. The following additional
material are also used :-
Neoprene or silicone rubber,
Brass,
Cast epoxy resin.
Consideration should be given to the environment in which these enclosures are to be used to
determine the suitability of these materials to withstand any corrosive agents that may be present.
Static Hazard
MJB units do not present a hazard from static electricity.
Vibration
MJB range terminal boxes are designed for use in areas subject to normal industrial levels of
vibration. They are not designed for use in areas subject to intentional or extreme conditions of
vibration.
Protection From Foreseeable Faults
Circuits connected in the enclosure must be externally protected using suitable circuit interruption
devices to prevent overloading. Provided the enclosure is correctly installed, there should be no
foreseeable faults.