MARTINDALE DRUMMOND G Clamp User manual

DRUGCLAMP FUSED G CLAMP TYPE BUS BAR CONNECTOR
Instruction
Manual

GENERAL SAFETY INFORMATION: Always read before proceeding.
Warning
These instructions contain both information and warnings that are necessary for the safe operation
and maintenance of this product. It is recommended that you read the instructions carefully and
ensure that the contents are fully understood. Failure to understand and to comply with the warnings
and instructions can result in serious injury, damage or even death.
In order to avoid the danger of electrical shock, it is important that proper safety measures are taken
when working with voltages exceeding 30V AC rms, 42V AC peak or 60V DC.
This product must only be used by a competent person capable of interpreting the results under the
conditions and for the purposes for which it has been constructed. Particular attention should be paid
to the Warnings, Precautions and Technical Specifications. Always check the unit is in good working
order before use and that there are no signs of damage to it. Do not use if damaged.
Where applicable other safety measures such as use of protective gloves, goggles etc. should be
employed.
Please keep these instructions for future reference. Updated instructions and product information are
available at: www.martindale-electric.co.uk
REMEMBER: SAFETY IS NO ACCIDENT
MEANING OF SYMBOLS:
Equipment complies with relevant EU Directives
End of life disposal of this equipment should be
in accordance with relevant EU Directives
Caution - risk of electric shock
Caution - risk of danger & refer to instructions
CAT IV Overvoltage Category IV (CAT IV) is for equipment at or near the origin of the electrical supply
including LV substation bus bars, electricity tariff meters and primary overcurrent protection
devices.
Thank you for buying one of our products. For safety and full understanding of its benefits please read this
manual before use. Technical support is available from 01923 441717 and [e-mail].
1. INTRODUCTION
1.2 Description
The DRUMMOND G Clamp is a moulded insulated clamp-on connector designed to provide a direct
connection to a rigid rectangular bus bar.
The clamp-on facility eliminates the need to drill the bus bar.
The insulated materials reduce the risk to the installer.
To counter the effects of vibration, a spring-loaded contact pin ensures consistent electrical contact force that
is independent of the clamp screw installed torque and a locking ring nut secures the clamp screw against
loosening.
Fluted grip features enable the clamping screw and locking ring nut to be tightened by hand while wearing
PPE insulated gloves. This eliminates the need to use tools within the bus bar chamber.

A 4mm shrouded socket is provided in the fluted head of the moulded screw.
The connection is suitable for up to 10A continuous use at 600V AC, subject to appropriate rating of the 4mm
plug and lead.
The fluted screw head incorporates a finger guard to signify the limit of the ACCESSIBLE area at the head of
the screw.
SPRING LOADED BRASS CONTACT PIN
G CLAMP BODY FLUTED RING NUTFLUTED SCREW HEAD WITH
MOULDED M16 THREAD
FINGER GUARD
SHROUDED 4mm SOCKET
HOLD G CLAMP FIRMLY
WHILE TIGHTENING
FLUTED SCREW
AND FLUTED RING NUT
BRASS CONTACT IS FULLY COMPRESSED
WHEN MOULDED SCREW TOUCHES BUS BAR.
CONTACT FORCE = 40N +/- 5N
OPEN G CLAMP
ENOUGH TO FIT OVER
BUS BAR
TYPICAL BUS BAR
MOUNT G CLAMP
ONTO TOP EDGE OF
BUS BAR
2. TIGHTEN
FLUTED RING NUT
BY HAND,
45°MAX, (ONE FLUTE).
1. TIGHTEN LARGE
FLUTED SCREW HEAD
BY HAND ONLY,
45°MAX
(ONE FLUTE).
ALLOW AT LEAST
35mm CLEARANCE
FOR DRUMMOND
4mm PLUG.
NOTE THAT OTHER
DESIGNS OF 4mm PLUG
MAY REQUIRE
CONSIDERABLY
MORE CLEARANCE
45°MAX
45°
MAX
12
12
14
14
22
22
HAZARDOUS LIVE
HAZARDOUS LIVE
CATEGORY IV600V
CATEGORY IV600V
50
52
35
87
87
ALLOW CLEARANCE FOR
HEAD OF FUSEHOLDER
ALLOW AT LEAST 75mm CLEARANCE
TO WITHDRAW FUSEHOLDER
ACCESIBLE FUSE
75
FUSEHOLDER
FUSEHOLDER
DISCONNECT 4mm PLUG
BEFORE UNSCREWING FUSEHOLDER.
TIGHTEN FUSHOLDER ONLY FINGER TIGHT.
ENSURE THAT FUSE 6.35 x 32mm IS
CORRECTLY MATCHED TO APPLICATION
2. PRODUCT SPECIFIC SAFETY INFORMATION
2.1 RISK ASSESSMENT
Warning
It must be noted that this G Clamp provides a direct electrical connection to a bus bar.
The G Clamp does not contain any attenuation or impedance.
Therefore, a full risk assessment must be undertaken by the installer or responsible body before any decision is
made to install or manipulate the G Clamp or the plug connection while the bus bar is HAZARDOUS LIVE.
Appropriate PPE must be worn unless the bus bar is known to be isolated from all risk of hazardous voltages
including the effects of capacitance, inductance, switching transients or lightning strike.
The installer must adhere to the working practices issued by the responsible body. Since these working
practices and the conditions of use are outside the control of Martindale Electric, no liability can be accepted for
the outcome.
2.2 Further checks
Warning
Before use check the unit for cracks or any other damage. Make sure the unit is free from dust, grease and
moisture. Also check any associated leads. Do not use if damaged.
Caution
Avoid severe mechanical shock or vibration and extreme temperature.
3. INSTALLATION
Warning
Refer to Risk Assessment at 2.1 before commencing installation.
The DRUMMOND G Clamp should be mounted on the top edge of the bus bar.
A location should be selected that allows easy access to hold the G Clamp securely while the screw is being
tightened. A suitable physical clearance is required to allow for the 4mm plug connection. This will depend on
the choice of plug. A clearance of 35mm is required for a standard DRUMMOND 4mm fixed-shroud plug. Note
that other designs of 4mm plug might require considerably more clearance. Moving elements of doors, hinges,
door locking systems and other covers must also be taken into account.
For withdrawal of fuse holder allow a further 75mm.

SPRING LOADED BRASS CONTACT PIN
G CLAMP BODY FLUTED RING NUTFLUTED SCREW HEAD WITH
MOULDED M16 THREAD
FINGER GUARD
SHROUDED 4mm SOCKET
HOLD G CLAMP FIRMLY
WHILE TIGHTENING
FLUTED SCREW
AND FLUTED RING NUT
BRASS CONTACT IS FULLY COMPRESSED
WHEN MOULDED SCREW TOUCHES BUS BAR.
CONTACT FORCE = 40N +/- 5N
OPEN G CLAMP
ENOUGH TO FIT OVER
BUS BAR
TYPICAL BUS BAR
MOUNT G CLAMP
ONTO TOP EDGE OF
BUS BAR
2. TIGHTEN
FLUTED RING NUT
BY HAND,
45°MAX, (ONE FLUTE).
1. TIGHTEN LARGE
FLUTED SCREW HEAD
BY HAND ONLY,
45°MAX
(ONE FLUTE).
ALLOW AT LEAST
35mm CLEARANCE
FOR DRUMMOND
4mm PLUG.
NOTE THAT OTHER
DESIGNS OF 4mm PLUG
MAY REQUIRE
CONSIDERABLY
MORE CLEARANCE
45°MAX
45°
MAX
12
12
14
14
22
22
HAZARDOUS LIVE
HAZARDOUS LIVE
CATEGORY IV600V
CATEGORY IV600V
50
52
35
87
87
ALLOW CLEARANCE FOR
HEAD OF FUSEHOLDER
ALLOW AT LEAST75mm CLEARANCE
TO WITHDRAW FUSEHOLDER
ACCESIBLE FUSE
75
FUSEHOLDER
FUSEHOLDER
DISCONNECT 4mm PLUG
BEFORE UNSCREWING FUSEHOLDER.
TIGHTEN FUSHOLDER ONLY FINGER TIGHT.
ENSURE THAT FUSE 6.35 x32mm IS
CORRECTLY MATCHED TO APPLICATION
The bus bar surface should be clean at the area of intended contact. If necessary, clean the bus bar surface
according to the instructions issued by the responsible body.
The G Clamp should be opened as far as necessary to engage fully over the edge of the bus bar. Hold the
G Clamp stable and tighten the M16 moulded screw against the face of the bus bar to compress the spring-
loaded brass contact. The brass contact will be compressed into the screw until the end face of the moulded
screw touches the surface of the bus bar. Tighten the fluted head of the moulded screw BY HAND a further 30
- 45 degrees. (Equivalent to ONE flute MAXIMUM). DO NOT OVERTIGHTEN.
After tightening the screw, tighten the fluted ring nut against the G Clamp body to lock the screw. Tighten the
fluted ring nut BY HAND a further 30 - 45 degrees after first touches the G Clamp body, (ONE flute MAXIMUM).
DO NOT OVERTIGHTEN.
SPRING LOADED BRASS CONTACT PIN
G CLAMP BODY FLUTED RING NUTFLUTED SCREW HEAD WITH
MOULDED M16 THREAD
FINGER GUARD
SHROUDED 4mm SOCKET
HOLD G CLAMP FIRMLY
WHILE TIGHTENING
FLUTED SCREW
AND FLUTED RING NUT
BRASS CONTACT IS FULLY COMPRESSED
WHEN MOULDED SCREW TOUCHES BUS BAR.
CONTACT FORCE = 40N +/- 5N
OPEN G CLAMP
ENOUGH TO FIT OVER
BUS BAR
TYPICAL BUS BAR
MOUNT G CLAMP
ONTO TOP EDGE OF
BUS BAR
2. TIGHTEN
FLUTED RING NUT
BY HAND,
45°MAX, (ONE FLUTE).
1. TIGHTEN LARGE
FLUTED SCREW HEAD
BY HAND ONLY,
45°MAX
(ONE FLUTE).
ALLOW AT LEAST
35mm CLEARANCE
FOR DRUMMOND
4mm PLUG.
NOTE THAT OTHER
DESIGNS OF 4mm PLUG
MAY REQUIRE
CONSIDERABLY
MORE CLEARANCE
45°MAX
45°
MAX
12
12
14
14
22
22
HAZARDOUS LIVE
HAZARDOUS LIVE
CATEGORY IV600V
CATEGORY IV600V
50
52
35
87
87
ALLOW CLEARANCE FOR
HEAD OF FUSEHOLDER
ALLOW AT LEAST75mm CLEARANCE
TO WITHDRAW FUSEHOLDER
ACCESIBLE FUSE
75
FUSEHOLDER
FUSEHOLDER
DISCONNECT 4mm PLUG
BEFORE UNSCREWING FUSEHOLDER.
TIGHTEN FUSHOLDER ONLY FINGER TIGHT.
ENSURE THAT FUSE 6.35 x32mm IS
CORRECTLY MATCHED TO APPLICATION
Equipment leads must use 4mm plugs of appropriate rating for the installation.
Attach the equipment lead to the 4mm socket in the head of the screw.
Leads should be dressed and supported so that no forces act on the G Clamp or the 4mm plug.
The G Clamp is intended to be a fixed connection.
SPRING LOADED BRASS CONTACT PIN
G CLAMP BODY FLUTED RING NUTFLUTED SCREW HEAD WITH
MOULDED M16 THREAD
FINGER GUARD
SHROUDED 4mm SOCKET
HOLD G CLAMP FIRMLY
WHILE TIGHTENING
FLUTED SCREW
AND FLUTED RING NUT
BRASS CONTACT IS FULLY COMPRESSED
WHEN MOULDED SCREW TOUCHES BUS BAR.
CONTACT FORCE = 40N +/- 5N
OPEN G CLAMP
ENOUGH TO FIT OVER
BUS BAR
TYPICAL BUS BAR
MOUNT G CLAMP
ONTO TOP EDGE OF
BUS BAR
2. TIGHTEN
FLUTED RING NUT
BY HAND,
45°MAX, (ONE FLUTE).
1. TIGHTEN LARGE
FLUTED SCREW HEAD
BY HAND ONLY,
45°MAX
(ONE FLUTE).
ALLOW AT LEAST
35mm CLEARANCE
FOR DRUMMOND
4mm PLUG.
NOTE THAT OTHER
DESIGNS OF 4mm PLUG
MAY REQUIRE
CONSIDERABLY
MORE CLEARANCE
45°MAX
45°
MAX
12
12
14
14
22
22
HAZARDOUS LIVE
HAZARDOUS LIVE
CATEGORY IV600V
CATEGORY IV600V
50
52
35
87
87
ALLOW CLEARANCE FOR
HEAD OF FUSEHOLDER
ALLOW AT LEAST75mm CLEARANCE
TO WITHDRAW FUSEHOLDER
ACCESIBLE FUSE
75
FUSEHOLDER
FUSEHOLDER
DISCONNECT 4mm PLUG
BEFORE UNSCREWING FUSEHOLDER.
TIGHTEN FUSHOLDER ONLY FINGER TIGHT.
ENSURE THAT FUSE 6.35 x32mm IS
CORRECTLY MATCHED TO APPLICATION
SPRING LOADED BRASS CONTACT PIN
G CLAMP BODY FLUTED RING NUTFLUTED SCREW HEAD WITH
MOULDED M16 THREAD
FINGER GUARD
SHROUDED 4mm SOCKET
HOLD G CLAMP FIRMLY
WHILE TIGHTENING
FLUTED SCREW
AND FLUTED RING NUT
BRASS CONTACT IS FULLY COMPRESSED
WHEN MOULDED SCREW TOUCHES BUS BAR.
CONTACT FORCE = 40N +/- 5N
OPEN G CLAMP
ENOUGH TO FIT OVER
BUS BAR
TYPICAL BUS BAR
MOUNT G CLAMP
ONTO TOP EDGE OF
BUS BAR
2. TIGHTEN
FLUTED RING NUT
BY HAND,
45°MAX, (ONE FLUTE).
1. TIGHTEN LARGE
FLUTED SCREW HEAD
BY HAND ONLY,
45°MAX
(ONE FLUTE).
ALLOW AT LEAST
35mm CLEARANCE
FOR DRUMMOND
4mm PLUG.
NOTE THAT OTHER
DESIGNS OF 4mm PLUG
MAY REQUIRE
CONSIDERABLY
MORE CLEARANCE
45°MAX
45°
MAX
12
12
14
14
22
22
HAZARDOUS LIVE
HAZARDOUS LIVE
CATEGORY IV600V
CATEGORY IV600V
50
52
35
87
87
ALLOW CLEARANCE FOR
HEAD OF FUSEHOLDER
ALLOW AT LEAST75mm CLEARANCE
TO WITHDRAW FUSEHOLDER
ACCESIBLE FUSE
75
FUSEHOLDER
FUSEHOLDER
DISCONNECT 4mm PLUG
BEFORE UNSCREWING FUSEHOLDER.
TIGHTEN FUSHOLDER ONLY FINGER TIGHT.
ENSURE THAT FUSE 6.35 x32mm IS
CORRECTLY MATCHED TO APPLICATION

In NORMAL use, after correct installation, the G Clamp is not intended to be hand-held or hand-manipulated
by the OPERATOR during measurements or tests.
After a suitably rated 4mm fixed-shroud plug has been connected to the 4mm socket in the screw head,
the area on the head side of the finger guard is rated CATEGORY IV 600V and provides REINFORCED
INSULATION against 8kV transient impulse.
The area on the threaded side of the finger guard should be treated as HAZARDOUS LIVE at all times.
SPRING LOADED BRASS CONTACT PIN
G CLAMP BODY FLUTED RING NUTFLUTED SCREW HEAD WITH
MOULDED M16 THREAD
FINGER GUARD
SHROUDED 4mm SOCKET
HOLD G CLAMP FIRMLY
WHILE TIGHTENING
FLUTED SCREW
AND FLUTED RING NUT
BRASS CONTACT IS FULLY COMPRESSED
WHEN MOULDED SCREW TOUCHES BUS BAR.
CONTACT FORCE = 40N +/- 5N
OPEN G CLAMP
ENOUGH TO FIT OVER
BUS BAR
TYPICAL BUS BAR
MOUNT G CLAMP
ONTO TOP EDGE OF
BUS BAR
2. TIGHTEN
FLUTED RING NUT
BY HAND,
45°MAX, (ONE FLUTE).
1. TIGHTEN LARGE
FLUTED SCREW HEAD
BY HAND ONLY,
45°MAX
(ONE FLUTE).
ALLOW AT LEAST
35mm CLEARANCE
FOR DRUMMOND
4mm PLUG.
NOTE THAT OTHER
DESIGNS OF 4mm PLUG
MAY REQUIRE
CONSIDERABLY
MORE CLEARANCE
45°MAX
45°
MAX
12
12
14
14
22
22
HAZARDOUS LIVE
HAZARDOUS LIVE
CATEGORY IV600V
CATEGORY IV600V
50
52
35
87
87
ALLOW CLEARANCE FOR
HEAD OF FUSEHOLDER
ALLOW AT LEAST 75mm CLEARANCE
TO WITHDRAW FUSEHOLDER
ACCESIBLE FUSE
75
FUSEHOLDER
FUSEHOLDER
DISCONNECT 4mm PLUG
BEFORE UNSCREWING FUSEHOLDER.
TIGHTEN FUSHOLDER ONLY FINGER TIGHT.
ENSURE THAT FUSE 6.35 x 32mm IS
CORRECTLY MATCHED TO APPLICATION
4. MAINTENANCE
4.1 Fuse Replacement
The Fused Drummond G Clamp is supplied as standard with a 6.35 dia X 32mm, 600V, 0.5A, 50kA ceramic
HRC rated fuse, but this may have been changed for a different fuse rating at the time of initial installation.
A fuseholder body containing the fuse is housed inside the main screw of the Fused G Clamp.
Disconnect 4mm plug from end of Fuseholder Body.
Unscrew fuseholder Body to access fuse according to the picture. The G Clamp itself does not need to be
disturbed.
Replace the fuse ONLY with the precise fuse specified for the installation.
Screw Fuseholder Body back into place.
Check security of G Clamp.
Apply suitable safety checks before re-connecting 4mm Plug, which will apply power immediately to the
installed wiring.
Spare fuses are available from Martindale Electric using order code FUSE500 (pack of 3).