CSLB C-7 Low Voltage Systems (Trade Exam) — All Questions

What voltage ceiling appears in the CSLB's definition of the C-7 Low Voltage Systems classification?

• a.120 volts
• b.91 volts✓
• c.50 volts
• d.600 volts

The C-7 definition covers energy-limited communication and low voltage systems that do not exceed 91 volts. Fifty volts is a Cal/OSHA work-practice threshold, not the license limit; 120 volts is ordinary branch-circuit voltage; and 600 volts is the dividing line used in some safety rules, not the C-7 scope.Cal. Code Regs. tit. 16 §832.07 (C-7 classification, CSLB)

Which system does the CSLB's C-7 classification name as included work?

• a.Low voltage landscape lighting✓
• b.Fire sprinkler piping
• c.Fire alarm notification circuits
• d.277-volt lighting branch circuits

The C-7 definition lists low voltage landscape lighting among its examples. Fire alarm systems are specifically excluded from C-7; 277-volt lighting circuits exceed the 91-volt limit and are electrical work; and sprinkler piping is fire protection work.Cal. Code Regs. tit. 16 §832.07 (C-7 classification, CSLB)

A company installs and services fire alarm systems as a fire alarm company operator. Which agency must license it, according to the CSLB?

• a.The Contractors State License Board✓
• b.No license is needed for alarm work
• c.The Bureau of Security and Investigative Services
• d.The Federal Communications Commission

The CSLB states that fire alarm company operators must be licensed by the CSLB. The Bureau of Security and Investigative Services licenses security alarm company operators, the FCC regulates radio services rather than contractors, and fire alarm work is not license-exempt.CSLB, Before Applying for the Examination (licensing exemptions)

A person's only business is installing satellite antenna systems on homes. What does the CSLB say about licensing for that activity?

• a.Exempt, but must register with a state bureau✓
• b.Needs neither a license nor a registration
• c.Must hold a C-7 license for this work
• d.Must hold a C-10 license because antennas are electrical

The CSLB lists persons whose only activity is installing satellite antenna systems on residential structures as exempt, but they must be registered with the Bureau of Electronic and Appliance Repair. A C-7 or C-10 license is not required for that narrow activity, and registration is still required.CSLB, Before Applying for the Examination (licensing exemptions)

Under Cal/OSHA's Low-Voltage Electrical Safety Orders, what limits apply to the source of a Class 1 power-limited circuit?

• a.Not over 30 volts and 1,000 volt-amperes✓
• b.Not more than 91 volts and 100 volt-amperes
• c.Not more than 600 volts, power unlimited
• d.Not more than 50 volts and 500 volt-amperes

A Class 1 power-limited circuit is supplied from a source rated not more than 30 volts and 1,000 volt-amperes. Ninety-one volts is the C-7 license limit; 600 volts with unlimited power describes Class 1 remote-control and signaling circuits; and 50 volts with 500 VA is not a class limit in the safety orders.Cal. Code Regs. tit. 8 §2585.1 (Class 1, 2 and 3 circuits)

Using the federal criterion's rule of thumb, about how large should a telecommunications room be to serve 10,000 square feet?

• a.About 1,100 square feet
• b.About 11 square feet
• c.Approximately 110 square feet✓
• d.About 500 square feet

The criterion sizes rooms at about 1.1 percent of the area served, so 10,000 × 0.011 = 110 square feet — its example is a 10-by-11-foot room. Eleven square feet uses 0.11 percent, 1,100 square feet uses 11 percent, and 500 square feet matches no rule in the criterion.UFC 3-580-01 (2024), para. 2-3.1.2.2 (telecommunications room sizing)

An architect shows a lay-in suspended ceiling in the new telecommunications room. What does the federal criterion say?

• a.A suspended ceiling is required to hide cable tray
• b.A suspended ceiling is not to be installed in the room✓
• c.A suspended ceiling is required for fire separation
• d.A suspended ceiling is allowed if it is plenum rated

The criterion says not to install suspended ceilings in telecommunications spaces, keeping overhead tray and ladder rack accessible. It is not required to hide tray, a plenum rating does not change the rule, and fire separation comes from rated walls and firestopping, not a lay-in ceiling.UFC 3-580-01 (2024), para. 2-3.1.2.3 (floors, walls, ceilings)

What backboards does the federal criterion require in a telecommunications room?

• a.Pegboard on the wall behind the rack
• b.Fire-retardant plywood, two walls✓
• c.Painted drywall on one wall
• d.Untreated plywood on every wall

Backboards must be fire-retardant-treated wood bearing the manufacturer's stamp, covering at least two adjacent walls. Drywall is not a backboard, untreated plywood lacks the fire-retardant treatment, and pegboard is not specified for mounting communications equipment.UFC 3-580-01 (2024), para. 2-3.1.5.1 (plywood backboards)

Under the federal criterion, which situation does NOT allow non-continuous supports (J-hooks) as the pathway?

• a.A run over 50 feet through supports✓
• b.A short run from tray to a single outlet
• c.A run supported from building structure
• d.A run of 12 cables in a dry ceiling

The criterion does not permit non-continuous supports in spaces over 50 feet total length through the support system. A short drop from tray, a light load within the 20-cable limit, and supports attached to structure are all consistent with its rules.UFC 3-580-01 (2024), para. 2-3.2.3.3 (non-continuous cable supports)

What conduit fill does the federal criterion use as its optimal design ratio?

• a.25 percent
• b.40 percent✓
• c.80 percent
• d.60 percent

The criterion uses an optimal conduit fill ratio of 40 percent and never more than 50 percent. Twenty-five percent is its initial design fill for cable tray, and 60 and 80 percent both exceed the 50 percent maximum.UFC 3-580-01 (2024), para. 2-3.2.3.2 (conduit)

Communications cable and power conductors share a pole. Where does the safety order place the communications cable, where practicable?

• a.On the same crossarm as the power
• b.Below the power conductors✓
• c.Above the power conductors
• d.Inside the power conductors' conduit

Where practicable, communications wires and cables on poles are located below the electric light or power conductors, and they may not be attached to a crossarm that carries power conductors. Placing them above power, on the power crossarm, or in a power conduit all contradict the rule.Cal. Code Regs. tit. 8 §2587.3 (conductor location)

Which installation does the California Electrical Code state it does NOT cover?

• a.A contractor's data cabling in an office building
• b.Optical fiber cable in a hospital
• c.Class 2 thermostat wiring in a house
• d.A phone company's own equipment in its own utility vault✓

The code does not cover communications equipment under the exclusive control of communications utilities, located outdoors or in spaces used only for such installations. Premises data cabling, optical fiber cable and Class 2 wiring in buildings are within its scope, which includes signaling and communications conductors and optical fiber cables.California Electrical Code 2025, Art. 90.2(D) (installations not covered)

A raised-floor computer room needs relocatable floor boxes fed by flexible metal conduit. What length limit does the federal criterion set for each flexible run?

• a.100 feet
• b.50 feet
• c.6 feet
• d.20 feet✓

Flexible metal conduit is allowed only for relocatable floor boxes in a raised floor, limited to 20 feet per run. Six feet is not the stated limit, 50 feet is the J-hook run limit, and 100 feet is the maximum conduit run between pull boxes.UFC 3-580-01 (2024), para. 2-3.2.3.2 (flexible metal conduit)

A unique wall penetration has no UL-tested firestop system available from any manufacturer. What does the federal firestopping specification require?

• a.A fire-rated paint over the opening
• b.Any caulk the installer has on hand
• c.The manufacturer's engineering judgment✓
• d.Leaving the penetration open until a system is tested

Where no tested system is available, the specification requires the manufacturer's engineering judgment, derived from similar tested designs and submitted for approval before installation. Random caulk is not a tested or engineered system, an open penetration defeats the wall's rating, and paint does not firestop an opening.UFGS 07 84 00, Firestopping (submittals)

The plumbing designer routes a domestic water line over the new data racks. What does the federal criterion say?

• a.Piping is fine if a ceiling tile is below it
• b.Piping must not be routed over racks or cabinets✓
• c.Piping may run over racks if it is insulated
• d.Piping is fine if the racks are grounded

Utility piping must not be routed over communications racks, cabinets or electrical panels; where unavoidable, special protection such as double-wall piping or drip pans with leak detection is required. Insulation, a ceiling tile or grounding the racks do not keep a leak off the equipment.UFC 3-580-01 (2024), para. 2-3.1.3.4 (room climate control)

Predictive RF design software is not available for an office Wi-Fi layout. What coverage radius per access point does the federal criterion allow?

• a.No more than 10 feet
• b.No more than 43 feet✓
• c.No more than 100 meters
• d.No more than 295 feet

Without predictive software, the criterion limits each access point's coverage radius to 43 feet (13 meters) in an office environment. One hundred meters is a cable reach for PoE and HDBaseT, 10 feet is far too small, and 295 feet is the horizontal cable limit.UFC 3-580-01 (2024), para. 2-3.5.3 (wireless access points)

Metal-sheathed aerial telephone cable enters a building where it could contact power conductors. What does the safety order require for the sheath?

• a.Remove the sheath inside the building
• b.Bond it to the lightning rod down conductor
• c.Ground it, or use an insulating joint at entry✓
• d.Leave it floating so it cannot carry current

The metal sheath of aerial cables exposed to power contact must be grounded, or interrupted close to the building entrance by an insulating joint or equivalent device. A floating sheath can carry a fault into the building, lightning conductors must stay 6 feet away from communications cable, and stripping the sheath is not the required protection.Cal. Code Regs. tit. 8 §2587.5 (grounding)

A new building has two elevators. How many communications work area outlets does the federal criterion call for in the elevator machine room?

• a.Four, two per elevator
• b.One for the whole machine room
• c.None; elevators use their own phones
• d.At least two, one per elevator✓

The criterion provides a minimum of one work area outlet in the elevator machine room for each elevator, so two elevators need at least two. One for the room falls short, providing none ignores the requirement, and four is more than the stated minimum.UFC 3-580-01 (2024), para. 2-3.4.4.5 (elevators)

What is the minimum conductor size for patch cords used with Power over Ethernet in the federal criterion?

• a.26 AWG
• b.24 AWG✓
• c.30 AWG
• d.28 AWG

The criterion requires PoE patch cords to be 24 AWG or larger, because thinner conductors heat more under power. Twenty-six, 28 and 30 AWG are all smaller (higher-numbered) gauges than 24 AWG, so none meets the minimum.UFC 3-580-01 (2024), para. 2-3.3.5 (bundling)

Over what maximum length does HDBaseT carry video, audio, power, Ethernet and control on one category cable, per the federal criterion?

• a.984 feet (300 meters)
• b.1,000 meters
• c.328 feet (100 meters)✓
• d.33 feet (10 meters)

The criterion says HDBaseT transports these signals over a single category cable up to 328 feet (100 meters). Ten meters is too short to describe it, 300 meters is OM3's 10-gigabit fiber reach, and 1,000 meters is a single-pair Ethernet reach, not HDBaseT.UFC 3-580-01 (2024), para. 2-3.5.2 (HDBaseT)

What jacket color does the TIA-598 scheme in the federal criterion assign to OM4 multimode fiber?

• a.Yellow
• b.Orange
• c.Slate
• d.Violet✓

The criterion's table lists OM4 as violet or aqua. Yellow is single-mode, orange is legacy OM2, and slate is legacy OM1.UFC 3-580-01 (2024), Table 2-3 (fiber jacket colors)

What bandwidth must passive CATV devices such as splitters and taps support under the federal criterion?

• a.500 MHz
• b.100 MHz
• c.1.0 GHz✓
• d.10 GHz

The criterion requires passive CATV devices to support 1 GHz bandwidth. One hundred and 500 megahertz are copper-cable test frequencies for Category 5e and 6A, and 10 GHz is not a CATV requirement in the criterion.UFC 3-580-01 (2024), para. 2-3.5.2 (CATV system)

Which coaxial cable does the federal criterion prohibit on CATV projects?

• a.RG-6
• b.RG-59✓
• c.RG-11
• d.625-series hardline

The criterion says not to use RG-59 for CATV projects. RG-6 is specified for drops, RG-11 is the minimum for trunks, and 625-series cable is suggested for longer trunk runs to reduce losses.UFC 3-580-01 (2024), para. 2-3.5.2 (CATV cabling)

A composite fiber-and-copper cable will power remote devices with low voltage dc. Why choose a larger copper gauge for longer runs?

• a.Larger copper removes the need for a UPS
• b.Larger copper makes the cable plenum rated
• c.Larger copper delivers power farther with less drop✓
• d.Larger copper raises the fiber's bandwidth

The criterion notes that larger-gauge copper delivers power over longer distances because voltage drop is lower. Copper size does not change fiber bandwidth or the cable's fire rating, and centralized power is still backed by a UPS for outages.UFC 3-580-01 (2024), para. 2-3.3.3.3 (composite cable)

Which NEC article does the federal criterion name for fault-managed power that can exceed the 100 watts of Class 2 and PoE?

• a.Article 800
• b.Article 90
• c.Article 760
• d.Article 726✓

The criterion cites NEC Article 726 for fault-managed power delivering more than the 100 watts afforded to Class 2 and PoE. Article 760 covers fire alarm systems, Article 800 communications circuits, and Article 90 is the code's introduction.UFC 3-580-01 (2024), para. 2-3.3.3.3 (fault managed power)

What is the smallest speaker cable allowed by the federal public address specification?

• a.18 AWG✓
• b.24 AWG
• c.22 AWG
• d.26 AWG

The specification says that in no case may speaker cable smaller than 18 AWG be used. Twenty-two, 24 and 26 AWG are all smaller conductors than 18 AWG.UFGS 27 51 16, Public Address Systems (speaker cable)

An entrance terminal will serve 40 used outside copper pairs. How many protector modules does the federal criterion call for?

• a.80
• b.40
• c.50✓
• d.45

Protector modules are furnished for all used pairs plus 25 percent, so 40 × 1.25 = 50, not to exceed the total pair count. Forty covers no spare, 45 is only 12.5 percent extra, and 80 doubles the count.UFC 3-580-01 (2024), para. 2-3.1.5.2 (protected entrance terminals)

How does the federal criterion terminate backbone fiber at patch panels?

• a.Twist the fibers together under heat-shrink
• b.Mechanical splices left unsupported in the tray
• c.Field-polish epoxy connectors on every strand
• d.Fusion-splice to factory pigtails or use MTP trunks✓

The criterion fusion-splices backbone fibers to factory-produced pigtails or uses factory MTP cables with breakout cassettes. Field-polished connectors and unsupported mechanical splices are not its methods, and twisting fibers together is not a splice at all.UFC 3-580-01 (2024), para. 2-3.3.1.2 (fiber backbone termination)

A clinic has 16 exam rooms with 2 drops each. Each run is 140 feet of path plus 10 feet of room slack and 1 foot of ceiling slack. How many 1,000-foot boxes are needed by total footage, before any waste allowance?

• a.5 boxes✓
• b.6 boxes
• c.3 boxes
• d.4 boxes

Each run is 140 + 10 + 1 = 151 feet, using the specification's room and ceiling slack; 32 runs × 151 = 4,832 feet, which needs 5 boxes. Four boxes (4,000 feet) is short, three boxes ignores half the cables, and six is a box more than the footage requires.UFGS 27 10 00 (2025), para. 3.4.2 (horizontal cable slack)

A rack design uses 32 rack units of equipment. How many total rack units satisfy the federal criterion's spare capacity rule?

• a.40✓
• b.64
• c.32
• d.36

The criterion requires 25 percent spare rack unit capacity, so 32 × 1.25 = 40 units. Thirty-two leaves no spare, 36 is only 12.5 percent extra, and 64 doubles the requirement.UFC 3-580-01 (2024), para. 2-3.1.5.3 (equipment racks)

Above what combined labor and material cost must a California home improvement job be in a written contract, per the CSLB?

• a.$5,000
• b.$1,000
• c.$250
• d.$500✓

The CSLB says the terms of all home improvement projects over $500 in combined material and labor costs must be in a contract. One thousand dollars is the licensing threshold for small jobs, $5,000 is not a contract threshold, and $250 is below the stated amount.CSLB, Terms of Agreement: A Consumer Guide to Home Improvement Contracts

A 70-year-old homeowner signs a contract for a home theater and network system. How long does the CSLB say the buyer has to cancel?

• a.Five business days✓
• b.Three business days
• c.No right to cancel
• d.Ten calendar days

The CSLB says a buyer has three business days to cancel, or five business days if the buyer is 65 or older, so this buyer has five. Three days applies to younger buyers, ten calendar days is not the rule, and the right to cancel does exist.CSLB, Terms of Agreement: A Consumer Guide to Home Improvement Contracts

Which device does the federal criterion recommend when pulling cable into underground ducts, to protect against over-tension?

• a.A steel fish tape
• b.A tighter cable tie at each duct
• c.A come-along with no gauge
• d.A rated breakaway swivel✓

The criterion recommends properly rated breakaway swivels and says not to exceed the manufacturer's pulling tension. A fish tape is for short pulls and has no tension protection, an ungauged come-along can overpull, and cable ties do nothing to limit pulling force.UFC 3-580-01 (2024), para. 3-9.1 (cable pulling tension)

How does the federal cabling specification prepare a fiber backbone cable for pulling?

• a.Pull on the fibers themselves with a grip
• b.Tape the jacket end and pull by the jacket
• c.Tie the strength members to the pulling eye✓
• d.Fusion splice a pull string to one fiber

The specification cuts the outer jacket back about 10 inches, leaves the strength members exposed, twists them together and attaches them to the pulling eye. Pulling on the fibers or on the jacket alone strains parts not designed to carry load, and a fiber cannot be spliced to a pull string.UFGS 27 10 00 (2025), para. 3.4.1 (fiber backbone cable)

A crew wants to use dish soap to ease a long cable pull. What does the federal cabling specification allow?

• a.Household soap that rinses clean
• b.Lubricants approved by the cable manufacturer✓
• c.No lubricant on communications cable
• d.Any lubricant, if tension stays under 25 lbf

The specification says to use only lubricants approved by the cable manufacturer. Household soap is not an approved lubricant, staying under the tension limit does not make an unapproved product acceptable, and approved lubricants are permitted.UFGS 27 10 00 (2025), para. 3.4.2 (horizontal cable)

Which cable tray support method does the federal cabling specification prohibit?

• a.Wall-mounted brackets
• b.A single center hanger✓
• c.Supports at the manufacturer's spacing
• d.Ceiling-hung brackets

The specification says not to install cable tray using a single center hanger. Wall-mounted brackets, ceiling-hung brackets and supports at the manufacturer's spacing are the methods it allows.UFGS 27 10 00 (2025), para. 3.3.3 (cable tray)

How are adjacent metal cable tray sections joined under the federal cabling specification?

• a.By butting the sections end to end
• b.With duct tape over the seam
• c.With cable ties at each joint
• d.Connector plates matching the tray✓

Adjacent tray sections are bonded together by connector plates identical in type to the tray sections, keeping the tray mechanically and electrically continuous. Cable ties and tape are not structural or bonding connections, and butted ends leave a gap in continuity.UFGS 27 10 00 (2025), para. 3.3.3 (cable tray bonding)

Cable passes straight through a junction box in a conduit run. How must the conduits enter and exit the box?

• a.On opposite sides of the box✓
• b.On adjacent sides, forming a 90-degree turn
• c.On the same side of the box
• d.Through the box cover

Conduit entries are arranged so cables passing through a box enter and exit at opposite sides. Entering and leaving on the same or adjacent sides forces tight bends inside the box, and pull boxes are not to be used as changes in direction.UFGS 27 10 00 (2025), para. 3.3.1 (interior distribution)

A cable route above a ceiling would rest the cables directly on a sheet-metal duct for 20 feet. What does the federal cabling specification say?

• a.Ducts are acceptable if the cable is plenum rated
• b.Ducts are acceptable for runs under 50 feet
• c.Ducts are not acceptable; cable must not touch them✓
• d.Ducts are acceptable supports if grounded

Cable must not be run through structural members or in contact with pipes, ducts or other potentially damaging items. Grounding, run length and a plenum rating do not turn a duct into an approved cable support.UFGS 27 10 00 (2025), para. 3.3.4 (non-continuous cable supports)

New underground conduit is installed to a gatehouse for future cable. What pull rope does the federal criterion require in it?

• a.200-lb rope, 5 ft slack each end✓
• b.A light string, cut flush with the conduit ends
• c.No pull rope until cable is ordered
• d.A steel fish tape left in place

The criterion places a pull string, rope or tape rated at least 200 pounds in each new conduit, with at least 5 feet of slack at each end tied to the plug. Flush-cut string can be pulled back into the conduit, a steel tape is a tool rather than a permanent pull line, and leaving none defeats the purpose.UFC 3-580-01 (2024), para. 3-6.12 (pull string, rope, tape)

How deep does the federal criterion place warning tape above underground communications conduit?

• a.At least 12 inches below the surface✓
• b.Directly on top of the conduit
• c.At the surface, as a visible marker
• d.At least 48 inches below the surface

Warning tape is installed at least 12 inches below the surface and kept at least 6 inches above the conduit or cable. At the surface it is not a buried warning, directly on the conduit gives no warning before an excavator reaches it, and 48 inches is the minimum cover for directly buried fiber.UFC 3-580-01 (2024), para. 3-6.9.2 (warning tape)

In the standard 25-pair color code, which colors identify pair 1?

• a.Violet-grey
• b.Red-blue
• c.White-blue✓
• d.White-orange

Pairs 1 to 5 have a white tip, and the first ring color is blue, so pair 1 is white-blue. Red-blue is pair 6, white-orange is pair 2, and violet-grey is pair 25.UFC 3-580-01 (2024), para. 3-9.5.1 (copper cable color code)

An outlet has two Category 6A cables. How should they be terminated in the telecommunications room under the federal criterion?

• a.On two different floors' panels
• b.Same panel, each one identified✓
• c.On a 66 block with no identifiers
• d.On one jack, splitting pairs between them

Cables from the same outlet are terminated on the same patch panel and individually identified, and copper cables are not split between connectors. Different panels scatter one outlet's cables, splitting pairs breaks the cable's geometry, and unidentified terminations defeat administration.UFC 3-580-01 (2024), para. 2-3.3.2.1 (CAT6A termination)

What does the federal criterion say about color coding of telecommunications components?

• a.Required for TIA-606 compliance
• b.Required for fiber, not copper
• c.Prohibited in favor of numbers
• d.Recommended, but it is not required✓

The criterion states that color coding of telecommunications infrastructure and components is recommended but not required; identifiers and printed labels are what administration relies on. Making it a TIA-606 requirement, prohibiting it, or requiring it for fiber all misstate the criterion.UFC 3-580-01 (2024), para. 2-5 (system administration)

Cable will run exposed under a raised floor in a computer room. What rating does the federal cabling specification require?

• a.Plenum rated✓
• b.General purpose
• c.Limited use
• d.Riser rated

The specification requires cable routed exposed under raised floors to be plenum rated and to comply with the code's plenum flammability requirements. Riser, general-purpose and limited-use ratings are lower fire ratings than plenum.UFGS 27 10 00 (2025), para. 3.3.4 (raised floors)

Why does the federal criterion specify mesh doors on equipment cabinets?

• a.To let technicians read labels without opening them
• b.To meet the cabinet's bonding requirement
• c.To reduce the cabinet's weight on the floor
• d.For front-to-rear airflow through the equipment✓

The criterion designs cabinets with 63 percent mesh doors, blanks and baffles to ensure front-to-rear airflow and avoid recirculation. Reading labels, bonding and weight are not the stated reasons; bonding is done with conductors and busbars, not door perforation.UFC 3-580-01 (2024), para. 2-3.1.5.4 (equipment cabinets)

Where more advanced cooling schemes are not used, how does the federal criterion arrange equipment rows?

• a.Rows facing the same direction
• b.Into alternating hot and cold aisles✓
• c.Back to back with no aisle
• d.In a ring around a floor fan

The criterion says equipment should be arranged into hot and cold aisles when more advanced cooling schemes are not used. Racks all facing one way blow exhaust into the next row's intakes, back-to-back racks without an aisle block service access, and a floor fan is not a cooling design.UFC 3-580-01 (2024), para. 2-3.1.3.4 (room climate control)

Which rack equipment does the federal criterion say to bond to the rack bonding busbar?

• a.Only the patch panels, never the switches
• b.Every device, by drilling through its case
• c.Only those with a maker's bonding connection✓
• d.Nothing; racks are bonded, equipment is not

The criterion says to bond only appliances that have manufacturer bonding connections available. Drilling cases is not an approved method, limiting bonding to patch panels is arbitrary, and equipment with a bonding point should be bonded along with the rack.UFC 3-580-01 (2024), para. 2-4.3 (rack bonding)

What does the federal cabling specification require before fastening conductors to a bonding busbar?

• a.Clean it and apply anti-oxidant✓
• b.Paint the busbar to prevent corrosion
• c.Sand the conductor insulation smooth
• d.Wrap the lug in electrical tape

The busbar is cleaned and an anti-oxidant is applied to the contact area to control corrosion and reduce contact resistance. Paint and tape insulate the very contact that must conduct, and sanding insulation does nothing for the connection.UFGS 27 10 00 (2025), para. 3.7 (telecommunications bonding)

An unpowered amplifier enclosure at a satellite installation connects only to a coaxial cable. When is the enclosure considered grounded under the safety order?

• a.If the coax shield is grounded✓
• b.When the coax is plenum rated
• c.Not until it has its own ground rod
• d.When it is mounted on a wooden wall

Unpowered equipment and enclosures are considered grounded where connected to an attached coaxial cable with an effectively grounded metallic shield. A separate ground rod is not required in that case, the mounting surface does not matter, and a plenum rating is about fire, not grounding.Cal. Code Regs. tit. 8 §2587.5 (grounding)