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Hi, I am trying to work out how long a 12 volt car battery will last before recharging is required? My basic understanding is that a 150 amp/hour battery will supply 150 amps for one hour, or 15 amps for ten hours. But what i need to know is how much charge can be taken from a battery safely and...

Hi! Just seeking help in regards to sizing cables to 415v 3ph motor's (DOL) on an industrial site on the basis of voltage drop. I beleive one technique is to use the locked rotor current and the power factor of the motor at the instant of start (locked rotor pf ?) in the voltage drop calculation...

Hi! Just seeking help in regards to sizing cables to 415v 3ph motor's (DOL) on an industrial site on the basis of voltage drop. I beleive one technique is to use the locked rotor current and the power factor of the motor at the instant of start (locked rotor pf ?) in the voltage drop calculation...

Hi, I work in a pilot hydrocarbon plant and am involved with installation of instrumentation. I'm trying to find some layman information regarding "NACE" rated valves etc, specifically why they are specified in refineries, & to help with my understanding and pitfalls associated with...

Hi, i'm an electrician at a pilot hydrocarbon processing plant in Australia. I'm trying to find a rule of thumb setting for the site incoming power supply under-voltage relay time delay. The reason is that the supply to the site was interrupted which caused equipment to stop. The result of this...

Hi, i'm an electrician at a pilot hydrocarbon processing plant in Australia. I'm trying to find a rule of thumb setting for the site incoming power supply under-voltage relay time delay. The reason is that the supply to the site was interrupted which caused equipment to stop. The result of this...

Hi, i'm an electrician at a pilot hydrocarbon processing plant in Australia. I'm trying to find a rule of thumb setting for the site incoming power supply under-voltage relay time delay. The reason is that the supply to the site was interrupted which caused equipment to stop. The result of this...