Technical Resources

CEE cable couplers for temporary electrical installations: festive lighting, trade fairs, mini-fairs and exhibition sites
Referring to SS 650-2: how joints, plugs and socket-outlets must be made in temporary installations for festive lighting, trade fairs and exhibitions, and how IEC 60309 (CEE) connectors meet the requirements. Read more...
Can ELV and power cables share a tray? SS 638 clause 528.1
Referring to SS 638 clause 528.1: when extra-low voltage control and signal circuits may run with 230/400 V power cables, the six permitted arrangements, and what else still applies. Read more...
Singapore's cable colour code: old and new
Since 1 March 2011, Singapore wires to the international colour code: brown, black and grey for line, blue for neutral. What changed, and where the old and new colours can be confused. Read more...
Sizing protective conductors: the adiabatic equation
How SS 638 sizes the earth conductor so it survives a fault until the breaker trips: the adiabatic equation, k values and the Table 54.7 shortcut. Read more...
Sizing a cable to SS 638: current rating and voltage drop
How to size a cable to SS 638, step by step: design current, breaker rating, correction factors for heat and grouping, then the 4% voltage drop check. Read more...
Insulation and sheath compounds: TI1, TM2, EI4 and EM2
What the EN 50363 compound codes on a datasheet mean, with strength and temperature limits for the compounds in the Goldberg range. Read more...
Copper conductor classes explained (IEC 60228)
What conductor classes 1, 2, 5 and 6 look like, why flexible conductors have higher resistance, and how to read the class from a cable code. Read more...
Cable voltage ratings: what Uā‚€/U means
Why every cable rating has two numbers, what Uā‚€ and U stand for, and how to match them to a 230/400 V supply. Read more...