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MR
medium rating busbar
technical information
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General features
MR is fully compliant with BS EN 60439-2, specifically, the rated current
of Zucchini busbar trunking systems is always rated at the average
ambient temperature of 40°C (the Standard requires 35°C), thus offering
the market suitably oversized products
The busbar casing is made from hot-dipped galvanised sheet steel
and forms a high strength outer structure, which also serves as the
protective conductor (PE) for the MR version
NOTE : 1000 A is supplied painted as standard
The individual conductors are made from either electrolytic copper or
electro tin-plated aluminium. Standard MR trunking is supplied with four
equal size conductors (TP and N +PE) whereas the optional
5 conductor version includes an additional integral 100% earth bar
(TP and N +E)
The degree of protection is IP 55 throughout the system
The normal recommended fixing centres for the MR range is 2·0 m
The jointing of MR lengths is done by overlapping two lengths and
fastening the special locating screws. The ‘monobloc’ joint is then
tightened by a double headed shear bolt to complete the electrical
connection. A joint cover is then positioned to complete the joint
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Trunking lengths – 3 m
The components and features of MR straight lengths are :
• a casing made of Senzimir quality galvanised steel used as protective
earth (PE). NOTE : 1000 A is supplied painted as standard
• overall dimensions : 75 to 135 x 196 mm
• painted casing available on request
(contact us on +44 (0) 845 600 6266)
• number of conductors : 4 with the same section (3P + N) with PE made
from the casing or 5 when using MR full (3P + N + PE), available in the
aluminum or electrolytic copper version with 99.9% purity
• conductors insulators are made of fiberglass reinforced plastic
material, ensuring a V1 self-extinguishing degree (according to UL 94),
in compliance with the glow-wire test according to IEC 60695-2-10
• tap-off outlets with a constant centre distance of 1 m on both sides of
the busbar (3 + 3 outlets every 3 m), set up for being connected to
plug-in type tap-off boxes. These outlets open and close automatically
when inserting or pulling out a tap-off box
• ‘monobloc’ electric junction system made with a silver coated copper
plate system to connect conductors and PE in a fast and reliable way
The ‘monobloc’ has shear-head bolts with a preset torque setting
which ensure good, long-lasting electrical continuity
• all components and accessories in the MR range are IP 55
• the whole busbar is flame retardant in compliance with the
IEC 60332-3 standard
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Trunking length – 3 m without outlets
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Tap-off outlet cover – IP 55
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Trunking lengths – 1 501 to 2999 mm without outlets
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Trunking lengths – 1 501 to 2999 mm with 2 + 2 outlets
625
375
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Trunking lengths – 1 000 to 1500 mm with 1 + 1 outlets
625
375
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Trunking lengths – 3 m with 5 outlets on one side only
500
625
500
500
500
375
205
90
150
196
75
135
3 000
110
3 135
3 135
160-315 A Al • 250-400 A Cu
400-1 000 A Al • 630-1 000 A Cu
205
90
150
196
75
135
1 501
≤
A
≤
2 999
110
160-315 A Al • 250-400 A Cu
400-1 000 A Al • 630-1 000 A Cu
162
196
75
160-315 A Al
250-400 A Cu
1 : only on
5 conductor
L
(PE)
1
L2
N
L3
pe
1 000
625
1 000
375
IP 55
All dimensions (mm) are nominal
162
196
135
400-1000 A Al
630-1000 A Cu