177 / 211
T ECHN I CAL DATA
POWE R T RACK MODU L E S
177
124
72.4
75
83
48
96 Ctrs
277
Minimum floor void 50mm
Conditional Short Circuit Rating
TRACK
Short circuit protection provided by fuselinks BS-88 and BS 1361 100 amp
maximum.
Prospective current 16.5kA
Mechanical withstand 10kA peak
Thermal withstand 1200A for 0.1 seconds
TAP-OFF UNITS
Mechanical withstand 10kA peak
Thermal withstand 1200A for 0.1 seconds
Earth Fault Loop Impedance
(measured at 1.0A)
The IEE Wiring Regulations require accurate determination of the total earth
loop impedance, which must be low enough to ensure that the protective
device will operate within the specified time, which for circuits incorporating
socket outlets is 0.4 seconds. The values for the Britmac System for calculating
the earth fault loop impedance are as follows:
Phase busbar
1.97mV/m
Earth busbar to housing
1.38mV/m
Earth busbar (Clean Earth)
1.97mV/m
Track connector
0.37mV
Supply connector
0.24mV
32A tap-off (4mm
2
x 3m), line
9.92mV
Volt Drop, Combined Phase & Neutral
(measured at 1.0A)
Busbar (line & neutral)
3.94mV/A/m
Track connector
0.74mV/A
Supply connector
0.48mV/A
32A tap-off (4mm
2
x 3m), line & earth 19.84mV/A/m
Cable Capacity of Terminals
Supply connector 16mm
2
csa stranded conductor
Construction
TRACK
Body extrusion
Galvanised Steel
Track base
Galvanised steel
Busbar
High conductivity copper
Degree of protection Track IP4X; In-feed housing IP3X C
TAP-OFF UNITS
Standard, Clean Earth and Dual Track tap-offs are non-interchangeable.
All types available in fused and unfused versions.
32A tap-off unit
The 32A tap-off is unfused with 3 metres of 16mm diameter flexible conduit
and 4mm
2
cables to BS 6004:2000 which are terminated in the tap-off via
welded connections.
Fused tap-off unit
Required where conduit lengths greater than 3 metres are used. The tap-off
unit is used as standard at 13 amps and is fitted to the specified length of
16mm diameter conduit and 2.5mm
2
cables to BS 6004:1995 which are
terminated in the tap-off via welded connections. The flexible conduit is
manufactured to BSEN 50086-1
STANDARDS
BSEN 60439: Part 1 & Part 2.
The track system enables compliance with the latest IEE Wiring Regulations,
BS 7671:2008.
TRACK CURRENT RATING
63 amps, 240V ac; 50Hz single phase ambient temperature 25C.
Tap-off
unit
Track
Cable feed end
21.2
20.7
83
69
60
41.9
48
41.9
71
FRONT ELEVATION
SIDE ELEVATION
STANDARD
CLEAN EARTH
DUAL TRACK
All dimensions in mm
83
71
Minimum floor void 73mm
277
TECHNICAL DATA UNDERFLOOR POWER TRACK MODULES
l