Home Improvement

What is the demand factor allowed by the NEC for calculating the neutral conductor size for an electric range load?

The minimum size required for the neutral conductor is 4 AWG (see Figure 2). When calculating the feeder or service neutral load, it is permissible to apply a demand factor of 70 percent to household electric ranges, wall-mounted ovens, counter-mounted cooking units and electric dryers.

Which of the following circuits require a minimum of 20A of overcurrent protection group of answer choices?

Which of the following circuits require a minimum of 20A of overcurrent protection? Residential small appliance branch circuits. according to the NEC, which of the following is required for the small appliance loads in each kitchen area? Two 120 volts, 20A Branch circuits.

What is the load for 55 of show window using the linear foot method?

Show window lighting is calculated at 200VA per linear foot plus 125% 13,750VA is the load for 55′ of show window using the linear foot method.

When used as an outside service entrance conductor Type SE cable must be secured every?

When used as a branch circuit or feeder, Type SE cable must be supported and secured in accordance with 334.30 at intervals not exceeding 4½ feet and within 1 foot of every outlet box, junction box, cabinet or fitting.

Which of the following must be supported at intervals of 6 feet or less?

According to NEC Article 330.30, MC cable must be supported and secured at intervals of 6 feet or less (unless routed through a framing member) and cables containing four or fewer conductors sized no larger than 10 AWG must be secured within 12 inches of every termination.

What is the demand factor allowed by the NEC for calculating?

The minimum size required for the neutral conductor is 4 AWG (see Figure 2). When calculating the feeder or service neutral load, it is permissible to apply a demand factor of 70 percent to household electric ranges, wall-mounted ovens, counter-mounted cooking units and electric dryers.

Which section of the NEC lists the requirements for installing service disconnecting means?

Per 2020 NEC section 230.70, a service disconnect is required to be installed for a building on the exterior of the building or inside nearest the point of entrance of the service conductors.

What is the minimum load per each linear foot that must be allowed for show window lighting?

200 volt-amperes per linear foot

For show-window lighting, a minimum load of 200 volt-amperes per linear foot (660 volt-amperes per linear meter) must be included for each show window [220.43(A)].

How do you calculate demand load?

Using Load Factor to Determine Demand Limit

  1. 3000 kWh divided by 720 hours = 4.16 (demand limit if at 100% load factor)
  2. 4.16 divided by .60 = ~7kW.
  3. 20kW multiplied by 720 hours = 14,400 Total kWh (if at 100% load factor) 3000 kWh divided by 14,400 Total kWh = 21% load factor at 20kW.

What is the minimum general lighting load in VA per square foot required by the NEC for A store?

The NEC calls for a minimum lighting load of 3 volt-amperes per square foot.

Which of the following conditions must be met before conductors are permitted by the NEC to be run in parallel?

All of the paralleled conductors in each phase, neutral or grounded set must be the same length and be made from the same conductor material. They must be the same circular mil area and have the same type of insulation. Finally, all parallel conductors must be terminated in the same manner.

What section of the NEC covers equipment grounding and equipment?

NEC 250 PART

NEC 250 PART VI: EQUIPMENT GROUNDING AND EQUIPMENT-GROUNDING CONDUCTORS.

Which section of the NEC covers equipment grounding and equipment grounding conductors?

Equipment grounding must be done in accordance with the National Electrical Code (NEC). NFPA 731 Section 4.8 requires grounding to be done in accordance with the National Electrical Code or NEC (NFPA 70). The NEC covers grounding in Article 250.

When the voltage is limited to 300V to ground the minimum clearance?

Vertical clearances

Article 225 doesn’t provide a clearance for over 150V. 12 feet above residential property and driveways, and commercial areas not subject to truck traffic if circuits of 300V to ground or less. It’s 15 feet for circuits over 300V to ground.

What type of cable is used for a corrugated sheath?

Type MC-Metal Clad Cables – (NEC Article 330) – Metal Clad cables are assemblies of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of interlocking metal tape, or a smooth corrugated sheath.

Which section of the NEC covers equipment grounding and equipment grounding conductors?

Equipment grounding must be done in accordance with the National Electrical Code (NEC). NFPA 731 Section 4.8 requires grounding to be done in accordance with the National Electrical Code or NEC (NFPA 70). The NEC covers grounding in Article 250.

When sizing electrical service at what percentage is the first 3000 VA rated?

Depending on the VA, the first 3,000 VA can be calculated at 100 percent and the remaining VA at 35 percent.

How do you calculate service demand load?

Calculating Load

  1. Add together the wattage capacity of all general lighting branch circuits.
  2. Add in the wattage rating of all plug-in outlet circuits.
  3. Add in the wattage rating of all permanent appliances (ranges, dryers, water heaters, etc.)
  4. Subtract 10,000.
  5. Multiply this number by . …
  6. Add 10,000.

How do you calculate electrical load demand?

The load factor calculation divides your average demand by your peak demand. To calculate your load factor take the total electricity (KWh) used in the billing period and divide it by the peak demand (KW), then divide by the number of days in the billing cycle, then divide by 24 hours in a day.

How do you calculate demand factor?

Demand Factor = Maximum demand / Total connected load = 1.5 Kw / 12 Kw = 0.125.

What is load demand factor?

: the ratio of the maximum demand during an assigned period upon an electric-power system to the load actually connected during that time expressed usually in per cent.

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