Yeah just hoping the 2.5mm 2 would be OK, save having to pay for bigger cable, since I already have 2 reels of the stuff. The maximum current rating of the cable is the maximum SAFE operating current to ensure those sorts of temps aren't reached (unless you're doing something idiotic). There is still some spare capacity in the cable CABLESTANDARDS BS EN 50525-2-41 (0.5mm 2 to 2.5mm ), SIA/SIAF generally to BS EN 50525-2-41 (4mm2 and above) APPLICATION CURRENT RATING IN AIR Amps at 30ºC at 60ºC at 90ºC at 120ºC at 150ºC at 170ºC 0.25 15 13 11 9 6 3 0.35 19 17 14 11 7 4 0.5 23 20 17 13 9 5 0.75 30 26 22 17 11 6 1Phase Motor draws Current = 7Amp per HP. 3 Phase Motor draws Current = 1.25Amp per HP. Full Load Current of 3 Phase Motor = HPx1.5. Full Load Current of 1 Phase Motor = HPx6. No Load Current of 3 Phase Motor = 30% of FLC. KW Rating of Motor = HPx0.75. Full Load Current of equipment = 1.39xKVA ( for 3 Phase Thewire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 Volts, 60°C through 90°C (140°F through 194°F), not more than three current-carrying conductors in raceway, cable, or earth (directly buried), based on ambient air temperature of 30°C (86°F). Search Amazon for your Electrical Discussionin ' Electricians' Talk ' started by roymondo, Nov 30, 2009 . roymondo Member. Cannot find the "cable" current-carring capacity for a ring main anywhere. Given 2.5mm twin and earth clipped direct is 27 amps, times two for parallel is 54 amps for a clipped direct, ring. So where does 32 amps come from ? A2.5mm cable is capable of supplying around 23-25 amps depending on the method of installation, so is fine, safe and compliant on a 20amp circuit breaker. How much current can 1.5 sq mm wire carry? 1.5 sqmm Finolex Electrical Wire, 90m Brand Finolex Wire Size 1.5 sqmm Certifications IS 694 : 1990 Insulation Material How much Carrying Capacity for SWA Cable information pages to help you size your cables, Try our free armoured cable calculator Blue Insulated Cable Lugs 1.5mm-2.5mm; Red Insulated Cable Lugs 0.5mm-1.5mm; Yellow Insulation Cable Lugs 4.0 – 6.0mm Conductor Short Circuit Rating (1 Sec/kA) Three Phase AC Clipped Direct RSPRO tri-rated cables are available in a variety of different coloured HR PVC sheaths including blue, black, red, brown, green, yellow and many more, to accommodate for a number of applications. RS PRO 2.5mm cross sectional area tri-rated cables feature a maximum current rating (Amperes) of 30A. ElandCables is a leading supplier of BASEC-approved low voltage armoured cables manufactured in accordance with British Standard BS5467 and BS6724. This includes PVC sheathed single core cables - XLPE/PVC/AWA/PVC - and multicore cables - XLPE/PVC/SWA/PVC - with a cable current ratings of 0.6/1kV and kV. Inthis post we will talk over all the technical specifications of twin and earth cables, from current carrying capacity through to bend radius and the temperature, environments the cable is designed to be installed in. 1.5mm twin and earth a very common cable to use in house hold lighting; 2.5mm twin and earth the vast majority of 32A ring dfoh1Vt.