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How do you wire in for two dryers?
You need two separate 240 VAC circuits from your electric panel that are each rated at 30 amps if they are electric dryers.
What is 7kva in amps?
In a standard 3 phase system in North America, 7kVa would be equivalent to 19.5 amps on each phase. The equation is: 7kva*1000/208v/1.73=19.45 amps (3 phase)
Can the Craftsman 73755 amp meter take accurate ac amp readings without separating the hot and neutral wires as the older catalogs stated?
A clamped- or forked-type ammeter can only measure the amps in one conductor at a time. Using it as you suggest would get a reading of 0 amps. This is because the reading of one conductor's amps cancels the other conductor's amps. Ammeters of this type actually measure the rise and fall of the magnetic field produced by the AC current. Since electrons in one conductor are moving the opposite direction of the other conductor, the magnetic fields cancel each other. On DC circuits, since there is no rise and fall of the magnetic field, it is constant, these type ammeters always read 0 amps on DC current.
What do you use a clamp meter for?
The clamp part is for measuring amps via induction. You set meter to amps and clamp around only a single wire. Device you are measuring must be operating. This means you couldn't clamp around a lamp cord to a table lamp since the current induced in each direction cancels out. You would have to separate the wires. An electrician would carry a short extension cord with the wires already separated. Most often a clamp meter is use to checks amps in a breaker panel on the black wire coming from the breaker.
Is it necessary to balance a house fuse panel to save electricity and if so why and how is it done?
A balanced house panel should be the ultimate goal. It will not save you electricity as the watt meter on the house monitors the use of power from both legs of the incoming power. To balance a panel you want the current from L1 to Neutral to equal L2 to Neutral. The neutral carries the unbalanced current between L1 and L2. A perfectly balanced panel will have no current on the neutral. It is done by knowing what the current draw is on every breaker. Then they are physically positioned so that they equal each other on the opposite leg. e.g. breaker 1 on leg L1 = 5 amps, breaker 2 on leg L2 = 10 amps, breaker 3 on leg L1 = 10 amps, breaker 4 on leg L2 = 5 amps. Total up all amperages on L1 and then on L2 , if they are equal then the panel is balanced with no current on the neutral.
