MEIGaN Sockets are all required to be
clean earth.
The reasons for generating a clean earth
If a metal back box is used that is in contact with the
building earth, a large amount of current can flow
through this path if there is a significant difference in
potential between the earth reference bar (ERB) and the
building earth at that point. This condition is more likely
to occur in an old building where there may be a link
between earth and neutral elsewhere in the wiring.
The fault current can create large amounts of noise into
the equipment that is being fed from the supply.
The presence of this fault can often be demonstrated by
measuring the touch voltage between the ERB and the
earth of the portable device.
The problem can be reduced by eliminating the current
path between the ERB and the building earth provided by
the earth connection in the mains socket. I.e. Use of a
clean earth socket
High Integrity Earth
Twin earth terminals.
All standard Crabtree twin switched sockets include
2 earth terminals to allow one model to be used in all
situations where high integrity installation are required.
Regulation 543.7.1 & 543.7.2 include the needs of high
integrity earth protection as “… requires an accessory to
be provided with 2 separate earth terminals”
Clean Earth.
Twin earth terminals for both earth bars
The Crabtree clean earth and MEIGaN range are what we
believe, the first complete clean earth 2 gang sockets
providing 2 earth bars completely separated and easily
identified, with 2 terminals on the functional earth and
2 earth terminals on the clean earth.
Metal Back box
The clean earth cable would be connected directly to the
clean earth terminal on the clean earth busbar mounted
on the top section of the socket marked with (clean
earth symbol)
The functional earth cable would be connected directly to
the metal back box earth terminal, which then would be
connected to the functional earth terminal on the busbar
mounted on the middle section of the socket marked
with (functional earth symbol)
Insulated Back box
The clean earth cable would be connected directly to the
clean earth terminal on the clean earth busbar marked
with
The functional earth cable would be connected directly to
the functional (dirty) earth terminal on the busbar
marked with
DESCRIPTION
LIST NUMBER
MEIGaN IPS sockets BLUE clean earth
13A DP 2 gang switched socket all BLUE clean earth with outboard white rockers
4307/DCE/BLUE
13A 2 gang unswitched socket all BLUE clean earth
7257/CE/BLUE
Additional products for Healthcare Installations
13A DP 1 gang switched socket with GREEN rocker twin earth
AM4304/D/GRN
13A DP 1 gang switched socket with RED rocker twin earth
4304/WH/RD
13A DP 1 gang switched socket all RED twin earth
4304/RED
13A DP 2 gang switched socket with RED rocker twin earth
4306/WH/RD
13A DP 2 gang switched socket all RED twin earth
4306/RED
13A DP 2 gang switched socket with outboard RED rocker twin earth
4307/RD
13A DP switched fused connection unit with RED rocker twin earth
4827/RD
13A DP switched fused connection unit all RED twin earth
4827/RED
13A unswitched fused connection unit all RED twin earth
4828/RED
Dimensions: 1 gang 86mm x 86mm, 2 gang 146mm x 86mm
●
All Crabtree sockets conform to BS 1363 – part 2 1995
●
All Crabtree switched sockets includes twin earth terminals for use where compliance with BS7671:2008 regulation 543-7 (IEE wiring regulations)
●
Crabtree also offer an Anti-microbial accessory range see Main Crabtree catalogue for information
FUNCTIONAL EARTH
For standard earthing of fixing screws,
including extraneous metal work.
2 Earth Terminals.
Capacity 6mm
2
.
CLEAN EARTH
2 Earth Terminals.
Capacity 6mm
2
.
7257/CE/BLUE
Unswitched Socket
