Incoming Metering Boxes (IMB / YaVU)

Purpose of YaVU

An electricity meter box — an incoming metering box (IMB, Ukr. ЯВУ) — is an enclosure for the electricity meter with an incoming circuit breaker and protection of outgoing feeders at 0.4 kV (400 V, 50 Hz). It is installed at the supply intake when the distribution system operator (DSO) requires a separate, sealable metering point. We build three-phase YaVU-3 units to your technical conditions — for indoor and outdoor installation. For outdoor installation an IP54 version is used; below −25 °C the metering compartment is fitted with heating — an option, not part of the base version.

Input-metering boxes YaVU (ЯВУ) are complete low-voltage distribution devices designed for input reception, commercial metering, and protection of outgoing lines in 0.4 kV (400 V) three-phase AC networks with a frequency of 50 Hz and a solidly grounded neutral. YaVU units are installed at the power supply input of industrial, utility and public facilities.

Structurally, the box is a front-access enclosure made of metal (powder-coated steel) or modified plastic (PC/ABS). Inside are located: an input circuit breaker, a space for an electricity meter (direct or transformer connection), distribution circuit breakers on the outgoing lines, PEN/N/PE terminals, and sealing lugs for the metering compartment.

Standards and types

• DSTU EN 61439-1:2014 — Low-voltage switchgear and controlgear assemblies. Part 1. General rules.
• DSTU EN 61439-3:2014 — Part 3. Distribution boards intended to be operated by ordinary persons.
• DSTU EN 60529:2018 — Degrees of protection provided by enclosures (IP code).
• Manufacturer's own technical specifications.

An incoming metering box is not only a wall box: delivered work includes floor-standing metering cabinets at 250, 600 and 630 A.

LK Energy Group has been manufacturing switchgear equipment at its own factory in Odesa since 2015 (company since 2005). We have been producing the YaVU line since 2015; these are three-phase YaVU-3 boxes for 400 V — from wall-mounted versions to floor-standing metering cabinets. Designs: for enterprises, utility and public facilities, developers. Degree of protection — IP31 for indoor premises and IP54 for outdoor installation.

Typical electrical circuit of YaVU

The basic design of YaVU-3 with direct meter connection consists of:

QF1

input circuit breaker (three poles for YaVU-3, rating — project-specific based on calculated current);

PI

three-phase electronic active energy meter (direct or transformer connection via CT);

QF2…QFn

circuit breakers on the outgoing lines (quantity and ratings — per technical specification);

XT

PEN/N/PE terminal set with a sealing lug on the metering compartment.

For transformer connection, the circuit additionally includes three current transformers (CT) with ratios of 100/5, 200/5, 400/5, 600/5, or 1000/5 — depending on the calculated current. A detailed schematic diagram for the specific design is included with the product's data sheet.

Main parameters of YaVU

*For IP54, the rated current is reduced relative to the values for IP31 — due to limited heat dissipation through the closed enclosure. The exact value is project-specific.

*Approximate dimensions, weight, and configuration. Final parameters are agreed upon at the inquiry sheet stage. Custom designs — per the Customer's technical specification.

Standard configuration of YaVU

• input circuit breaker for the calculated current;
• space for an electricity meter with direct or transformer connection (DIN rail or mounting panel);
• circuit breakers on the outgoing lines;
• PEN/N/PE terminal block with a sealing lug;
• set of sealing lugs for the metering compartment;
• mounting loops / brackets for wall mounting.

Options on request

• current transformers (CT) 100/5…1000/5 for indirect meter connection;
• surge protection devices (SPD) class I+II;
• 230 V service outlet in a separate compartment;
• heating of the metering compartment for outdoor installation (below -25 °C);
• LED compartment lighting with door switch;
• enclosure color — RAL 7035 (light gray) standard, other RAL colors — on request.

Electricity meters

The box is supplied without a meter. The model is determined by the technical conditions of your DSO (Oblenergo). All installed meters must be certified in Ukraine and included in the DSO's register.

Lead time and warranty

Typical manufacturing time — 5–7 business days for standard models, up to 14 days for custom designs*. Warranty — 2 years from the date of commissioning (extended to 5 years by agreement); enclosure metalwork — 10 years*.

*Approximate lead times and conditions. Exact lead time and warranty — as specified in the supply agreement.

Typical electrical diagram of YaVU (Ukr. ЯВУ):

The diagram is shown for the basic design of YaVU-3 with direct-connected metering. Composition:

QF1

input automatic circuit breaker (three poles for YaVU-3, rating selected according to the calculated current)

PI

three-phase electronic active energy meter (direct-connected up to 100 A or transformer-connected via CT)

QF2…QFn

automatic circuit breakers on the outgoing lines (quantity and ratings — per technical specification)

XT

PEN/N/PE terminal block with a sealing lug on the metering compartment

For transformer connection, the circuit additionally includes three current transformers (CT) with ratios of 100/5, 200/5, 400/5, 600/5, or 1000/5 — depending on the calculated current. A detailed schematic diagram for the specific design is included with the product's data sheet.

Main parameters of YaVU (ЯВУ):

*For IP54, the rated current is reduced by 15% relative to the values specified for IP31, due to limited heat dissipation through the closed enclosure.

*Approximate dimensions, weight, and configuration. Final parameters are agreed upon at the inquiry sheet stage. Custom designs — per the Customer's technical specification.

Standard configuration of the YaVU (ЯВУ)

• incoming circuit breaker rated for the design current;
• space for a direct-connected or CT-connected electricity meter (DIN rail or mounting panel);
• circuit breakers on the outgoing lines;
• PEN/N/PE terminal block with a sealing lug;
• set of sealing lugs for the metering compartment;
• mounting loops / brackets for wall-mounted installation.

Options on order:

• current transformers (CT) 100/5…1000/5 for indirect meter connection;
• surge protection devices (SPD) class I+II;
• 230 V service outlet in a separate compartment;
• heating of the metering compartment for outdoor installation (-45…-25 °C);
• LED compartment lighting with a door switch;
• enclosure colour — RAL 7035 (light grey) standard, other RAL colours — on order.

Electricity meters:

The enclosure is supplied without a meter. The model is determined by the technical requirements of your DSO (regional power distribution company, Oblenergo). All installed meters must be certified in Ukraine and listed in the DSO register.

Lead time and warranty:

Typical manufacturing lead time — 5-7 working days for standard models, up to 14 days for custom designs*. Warranty — 2 years from the date of commissioning (extended to 5 years by agreement); enclosure metalwork — 10 years*.

*Approximate lead times and terms. The exact lead time and warranty are specified in the supply agreement.

An electricity meter box — a 0.4 kV metering panel (IMB / YaVU) — is a complete low-voltage assembly (400 V, 50 Hz) for accepting the supply from the DSO, commercial metering and protection of outgoing feeders. The rated current follows the calculated intake current: direct meter connection up to 100 A, above that via current transformers with ratios 100/5…1000/5. LK Energy Group — a switchgear manufacturer from Odesa, in business since 2005, with its own factory since 2015: every unit ships with a data sheet and a test report; a certificate of conformity is issued at the customer's request. The rated current and design are selected per project based on the calculated current (direct meter connection up to 100 A, above that via current transformers 100/5…1000/5). Typical example: IMB-3, incoming breaker + 3-phase meter + feeder breakers. Heating for the metering compartment is added on request — for outdoor installation in cold regions. Technical data sheet (PDF) ↓ Inquiry form for sizing →

Technical data sheet (PDF) ↓Inquiry form for sizing →