The installation of both Sceptre and Maxi-Trunking is very similar with the main differences being the application. With a wide range of clip-on fittings and flush accessory boxes the Sceptre range is ideal for fast and efficient installation in perimeter locations. The Maxi range with moulded, fabricated or clip-on fittings is ideal for encasement of cables in most situations. Both systems can be easily sub-divided by utilising clip-in dividing fillets to maintain cable segregation, the total number of compartments dependable upon the type of trunking. Clip-in cable retainers maintain the cable segregation while giving the benefit of a third hand in lid down situations.

BASE PERIMETER

The base should be secured every 500mm by drilling alternating 6mm holes either side of centre as is practical and fasten using No. 8 round head screws with washers. Avoid over tightening to permit thermal movement. See Material Data page 200 for Thermal Properties.

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BASE SUSPENDED

When the trunking is to be installed suspended on brackets consideration to number and type of cables should be given, which equates to a maximum deflection of 1%.

Notes to Table
1. The spacings tabulated allow for maximum fill of cables and the thermal limits specified in the relevant British Standards. They assume that the trunking is not exposed to other mechanical stress.
2. The above figures do not apply to lighting suspension trunking, or where special strengthening couplers are used.

JOINTS
All lengths of trunking should be connected using an internal or external coupler with 3mm of movement available between consecutive lengths of trunking. The external coupler is designed for perimeter applications with 10mm of overlap on each side, the internal coupler should be cemented at one end using MSC3 solvent adhesive and the projecting end coated with MSC1 lubricant sealant. This provides a seal and facilitates thermal movement of the trunking due to change in temperature and should align with any support bracket.

CLIP-ON FITTINGS

The clip-on fittings are for perimeter use only and on internal and external bends, the trunking base must be mitred to ensure total enclosure of the trunking.

FABRICATED FITTINGS

Sceptre trunking fabricated fittings come complete with external couplings (see joints) and the lid ‘cut back’ ready for installation. Maxi-Trunking fabricated fittings are supplied with internal couplings and lids that extend beyond the base maintaining non-alignment between base and lid joints for maximum strength.

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MOULDED FITTINGS

These are two-part fittings with a female slide fit over the trunking. For both perimeter and suspended applications.

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END CAPS
These should be cemented into position for security using solvent adhesive MSC3.

LIDS When utilising the internal coupler, especially in suspended applications, it is recommended the lid extends beyond the trunking joint by a minimum of 50mm for additional rigidity.

DIMENSIONS AND CABLE CAPACITIES

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	DTR1 A = 3168mm2 total area 45% SF = 1426mm2. A = 816mm2 total area 45% SF = 367 sq mm. B = 2002mm2 total area 45% SF = 901 sq mm.		DTR2 A = 1731mm2 total area 45% SF = 779mm2. A = 435mm2 total area 45% SF = 196mm2. B = 1197mm2 total area 45% SF = 538mm2.
	MTRS50 A = 1979mm2 total area 45% SF 890mm2. A = 911mm2 total area 45% SF = 410mm2.		MTRS75 A = 4709mm2 total area 45% SF = 2119mm2. A = 2196mm2 total area 45% SF = 988mm2
	MTRS75/50 A = 3032mm2 total area 45% SF = 1365mm2. A = 1347mm2 total area 45% SF = 606mm2.		MTRS100/50 A = 4040mm2 total area 45% SF = 1818mm2. A = 1056mm2 total area 45% SF 475mm2. B = 660mm2 total area 45% SF = 297mm2. C = 1829mm2 total area 45% SF = 823mm2.
	MTRS100 A = 8733mm2 total area 45% SF = 3930mm2. A = 2375mm2 total area 45% SF = 1069mm2. B = 1464mm2 total area 45% SF = 659mm2. C = 4075mm2 total area 45% SF = 1834mm2.		MTRS150 A = 20193mm2 total area 45% SF = 9087mm2. A = 4406mm2 total area 45% SF = 1983mm2. B = 4728mm2 total area 45% SF = 2128mm2. C = 9482mm2 total area 45% SF = 4267mm2.